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1800+ Nouns That Start With O

    Nouns That Start With O

    Nouns are words that represent people or things. They are often the subject or object of a sentence. Nouns that start with O are some of the most interesting and unique words in the English language.

    Some of the most common nouns that start with O include “object,” “operation,” and “organization.” However, there are many more unique and interesting nouns that start with this letter.

    For example, the noun “ocean” represents a large body of water. The noun “octopus” represents a sea creature with eight arms. The noun “opossum” represents a North American marsupial.

    As you can see, there are many different types of nouns that start with O. Each one has its own definition and meaning. Learning about these words can help you better understand the English language.

    Nouns That Start With The Letter O

    Nouns That Start With O

    There are many interesting nouns that start with the letter O. Here are just a few of them:

    • Oasis: A oasis is a small, green oasis in the middle of a desert.
    • Oatmeal: Oatmeal is a type of porridge made from oats. It is a healthy breakfast option and can be eaten with milk, fruit, or honey.
    • Ocelot: The ocelot is a small, wild cat that is found in Central and South America. They are nocturnal animals and are excellent climbers.
    • Octopus: Octopuses are eight-armed sea creatures that are known for their intelligence. They are found in all the world’s oceans and are popular in many cultures as a food source.
    • Odometer: An odometer is a device that is used to measure the distance traveled by a vehicle.
    • Off-road: Off-road refers to driving on terrain that is not paved, such as dirt roads or trails.
    • Ogre: An ogre is a mythical creature that is often described as being large and ugly.
    • Ohm: The ohm is the unit of measurement for electrical resistance.
    • Oil: Oil is a type of fossil fuel that is used to power many vehicles and machines.
    • Olympics: The Olympics are a series of international sporting events that are held every four years.
    • Opera: Opera is a type of musical theatre that originated in Italy in the 16th century.
    • Orange: The orange is a type of fruit that is named for its orange color. It is a popular citrus fruit that is used in many recipes.
    • Orchestra: An orchestra is a large group of musicians who play together. They are often seen in symphony halls and opera houses.
    • Organ: An organ is a musical instrument that is played using a keyboard. Organs are often used in churches and cathedrals.
    • Ostrich: The ostrich is a large bird that is native to Africa. They are the largest bird in the world and can run up to speeds of 40 miles per hour.
    • Otter: Otters are small, aquatic mammals that are found in many parts of the world. They are known for their playful nature and their thick fur.
    Read:  3600+ Nouns That Start With E

    31 Nouns That Start With OA

    OahuThe third largest of the Hawaiian islands; population 905,000 (est. 2008). Its principal town, Honolulu, is the capital of Hawaii. It is the site of Pearl Harbor, a US naval base.
    Oakhamtown in Leicestershire in east central England that was the capital of the former county of Rutlandshire population11000
    OaklandAn industrial port in California, on the eastern side of San Francisco Bay; population 404,155 (est. 2008).
    Oakleycity in California northeast of Oaklandpopulation35432
    OatesJoyce Carol 1938– American writerTitus 1649–1705 British fabricator of the Popish Plot
    OaxacaA state of southern Mexico.
    oafA stupid, uncultured, or clumsy person.
    oafsA stupid, uncultured, or clumsy person.
    oakA tree that bears acorns as fruit, and typically has lobed deciduous leaves. Oaks are common in many north temperate forests and are an important source of hard and durable wood used chiefly in construction, furniture, and (formerly) shipbuilding.
    oaksA tree that bears acorns as fruit, and typically has lobed deciduous leaves. Oaks are common in many north temperate forests and are an important source of hard and durable wood used chiefly in construction, furniture, and (formerly) shipbuilding.
    oakumLoose fiber obtained by untwisting old rope, used especially in caulking wooden ships.
    oarA pole with a flat blade, pivoting in an oar lock, used to row or steer a boat through the water. Row; propel with or as with oars.
    oarsA pole with a flat blade, pivoting in an oar lock, used to row or steer a boat through the water. Row; propel with or as with oars.
    oarsmanA rower, especially as a member of a racing team.
    oarsmanshipone who rows especially in a racing crew
    oarswomanA female rower, especially as a member of a racing team.
    oasisA fertile spot in a desert, where water is found.
    oastA kiln used for drying hops.
    oast-housea usually conical kiln used for drying hops, malt, or tobacco
    oast-housesa usually conical kiln used for drying hops, malt, or tobacco
    oastsA kiln used for drying hops.
    oatA cereal plant cultivated chiefly in cool climates and widely used for animal feed as well as human consumption.
    oatcakeA thin, unleavened cake made of oatmeal.
    oatcakesA thin, unleavened cake made of oatmeal.
    oaterA western movie or television show.
    oatersA western movie or television show.
    oathA solemn promise, often invoking a divine witness, regarding one’s future action or behavior. A coarse or blasphemous word or phrase used to express anger or other strong emotion.
    oathsA solemn promise, often invoking a divine witness, regarding one’s future action or behavior. A coarse or blasphemous word or phrase used to express anger or other strong emotion.
    oatmealMeal made from ground oats, used in breakfast cereals or other food. A grayish-beige color flecked with brown.
    oatmealsmeal made from oats
    oatsA cereal plant cultivated chiefly in cool climates and widely used for animal feed as well as human consumption.

    172 Nouns Starting With OB

    Obadiah(in the Bible) a Hebrew minor prophet.
    obeahA kind of sorcery practiced especially in the Caribbean.
    obecheA tropical tree native to West and central Africa, grown for its pale timber which is used for plywood and veneers.
    obeliskA stone pillar, typically having a square or rectangular cross section and a pyramidal top, set up as a monument or landmark.
    obelusA symbol (†) used as a reference mark in printed matter, or to indicate that a person is deceased. A mark (– or ÷) used in ancient texts to mark a word or passage as spurious, corrupt, or doubtful.
    obesityThe state or condition of being very fat or overweight.
    obiismThe practice of obeah; belief in obeah.
    obisA broad sash worn around the waist of a Japanese kimono.
    obitsAn obituary.
    objectA material thing that can be seen and touched. A person or thing to which a specified action or feeling is directed. Grammar Computing Say something to express one’s disapproval of or disagreement with something.
    objectsA material thing that can be seen and touched. A person or thing to which a specified action or feeling is directed. Grammar Computing Say something to express one’s disapproval of or disagreement with something.
    oblastAn administrative division or region in Russia and the former Soviet Union, and in some of its former constituent republics.
    oblastsAn administrative division or region in Russia and the former Soviet Union, and in some of its former constituent republics.
    oblate(of a spheroid) flattened at the poles. A person dedicated to a religious life, but typically having not taken full monastic vows.
    oblongAn object or flat figure in an elongated rectangle or oval shape. Having an elongated shape, as a rectangle or an oval.
    oboesA woodwind instrument with a double-reed mouthpiece, a slender tubular body, and holes stopped by keys.
    obolusHistory (In form Obolus) a genus of fossil brachiopods having a smooth orbicular shell, widespread in Cambrian and Ordovician rocks; (also obolus) a brachiopod of this genus.
    obsDenoting exposure or openness. Denoting opposition, hostility, or resistance. Denoting extensiveness, finality, or completeness. (in modern technical words) inversely; in a direction or manner contrary to the usual.
    obtundDull the sensitivity of; blunt; deaden.
    ObanOberammergauOberhausen
    OberlandOberonoba
    obasobbligatoobbligatos
    obduracyobeahismobeahs
    obechesobedienceobedientiaries
    obedientiaryobeisanceobeisances
    obelisksobeyerobeyers
    obfuscationobfuscationsobi
    obitobituariesobituary
    objectificationobjectionobjections
    objectiveobjectivenessobjectives
    objectivismobjectivistobjectivists
    objectivitiesobjectivityobjector
    objectorsobjurgationobjurgations
    oblatenessoblatesoblation
    oblationsobligationobligations
    obligatoobligatorinessobligatos
    obligeeobligeesobligingness
    obligorobligorsoblique
    obliquenessobliquesobliquities
    obliquityobliterationobliterations
    oblivionoblivionsobliviousness
    oblongsobloquiesobloquy
    obmutescenceobnoxiousnessoboe
    oboistoboistsobreption
    obscenitiesobscenityobscurant
    obscurantismobscurantistobscurantists
    obscurantsobscurationobscurations
    obscureobscurenessobscures
    obscuritiesobscurityobsecration
    obsecrationsobsequiousnessobservableness
    observanceobservancesobservation
    observationsobservatoriesobservatory
    observerobserversobsession
    obsessionsobsessivenessobsidian
    obsolescenceobsoletenessobstacle
    obstaclesobstetricianobstetricians
    obstetricsobstinacyobstinateness
    obstipationobstipationsobstreperousness
    obstructobstructerobstructers
    obstructionobstructionismobstructionist
    obstructionistsobstructionsobstructiveness
    obstructorobstructorsobstructs
    obstruentobstruentsobtainment
    obtentionobtentionsobtestation
    obtestationsobtruderobtruders
    obtrusivenessobtundsobturation
    obturatorobturatorsobtuseness
    obumbrationobumbrationsobverse
    obversesobversionobversions
    obviationobviationsobviousness

    142 Words That Start With OC Nouns

    OceaniaAn area that encompasses the islands of the Pacific Ocean and adjacent seas.
    OceanusThe son of Uranus (Heaven) and Gaia (Earth), the personification of the great river believed to encircle the whole world.
    Ockham(c. 1285–1349), English philosopher and Franciscan friar. A defender of nominalism, he is known for the maxim called “Occam’s razor. ”.
    OctansA faint southern constellation (the Octant), containing the south celestial pole. postpositive
    OctoberThe tenth month of the year, in the northern hemisphere usually considered the second month of autumn.
    ocaA South American plant related to wood sorrel, long cultivated in Peru for its edible tubers.
    ocarinaA small egg-shaped wind instrument with a mouthpiece and holes for the fingers.
    occultsSupernatural, mystical, or magical beliefs, practices, or phenomena. Of, involving, or relating to supernatural, mystical, or magical powers or phenomena. Medicine Cut off from view by interposing something.
    oceanA very large expanse of sea, in particular each of the main areas into which the sea is divided geographically.
    oceanicRelating to the ocean.
    oceanidA sea nymph; one of the daughters of Oceanus.
    oceansA very large expanse of sea, in particular each of the main areas into which the sea is divided geographically.
    ocelotA medium-sized wild cat that has a tawny yellow coat marked with black blotches and spots, and ranges from southern Texas through South America.
    ocelotsA medium-sized wild cat that has a tawny yellow coat marked with black blotches and spots, and ranges from southern Texas through South America.
    ocherAn earthy pigment containing ferric oxide, typically with clay, varying from light yellow to brown or red.
    ochreAn earthy pigment containing ferric oxide, typically with clay, varying from light yellow to brown or red.
    ockerA boorish or aggressive person, especially an Australian man.
    ockersA boorish or aggressive person, especially an Australian man.
    ocreaA dry sheath around a stem formed by the cohesion of two or more stipules, characteristic of the dock family.
    octadsA group or set of eight.
    octagonA plane figure with eight straight sides and eight angles.
    octalRelating to or using a system of numerical notation that has 8 rather than 10 as a base. The octal system; octal notation.
    octaneA colorless flammable hydrocarbon of the alkane series, obtained in petroleum refining.
    octantAn arc of a circle equal to one eighth of its circumference, or the area enclosed by such an arc with two radii of the circle.
    octantsAn arc of a circle equal to one eighth of its circumference, or the area enclosed by such an arc with two radii of the circle.
    octaveMusic A poem or stanza of eight lines; an octet. The eighth day after a church festival, inclusive of the day of the festival. Fencing
    octavesMusic A poem or stanza of eight lines; an octet. The eighth day after a church festival, inclusive of the day of the festival. Fencing
    octavoA size of book page that results from folding each printed sheet into eight leaves (sixteen pages)
    octavosA size of book page that results from folding each printed sheet into eight leaves (sixteen pages)
    octetA group of eight people or things.
    octetsA group of eight people or things.
    octetteA group of eight people or things.
    octopodA cephalopod mollusk of the order Octopoda; an octopus.
    ocularOf or connected with the eyes or vision.
    oculusA round or eye-like opening or design, such as a circular window or an opening at the apex of a dome.
    OccamOccamismOccamist
    OccidentalismOccidentalistOceanian
    OctaviaOctavianOctobrist
    ocarinasocasoccasion
    occasionalismoccasionalityoccasions
    occidentoccidentaloccidentals
    occipitaloccipitalsocciput
    occiputsocclusionocclusions
    occlusiveocclusivesoccult
    occultationoccultationsoccultism
    occultistoccultistsoccultness
    occupanciesoccupancyoccupant
    occupantsoccupationoccupations
    occupieroccupiersoccupying
    occurrenceoccurrencesoceanarium
    oceanariumsoceanidesoceanids
    oceanographeroceanographersoceanography
    oceanologyocellationocellations
    ocellusochlocracyochlocrat
    ochlocratsochlophobiaochrea
    ochresocotilloocotillos
    octachordoctachordsoctad
    octagonsoctahedriteoctahedron
    octahedronsoctameteroctameters
    octanesoctaroonoctaroons
    octettesoctillionoctillions
    octillionthoctillionthsoctocentenaries
    octocentenaryoctodecimooctodecimos
    octogenarianoctogenariansoctonaries
    octonaryoctopodesoctopods
    octopusoctopusesoctoroon
    octoroonsoctosyllableoctosyllables
    octroioctroisoctuple
    octuplesoctupletoctuplets
    ocularistocularsoculist
    oculistsoculomotor

    55 Nouns Beginning With OD

    OderA river of central Europe that rises in the mountains in western Czech Republic, flows north through western Poland to meet the Neisse River, and then continues north to form the northern part of the border between Poland and Germany before flowing into the Baltic Sea.
    OdessaA city and port on the southern coast of Ukraine, on the Black Sea; population 1,008,600 (est. 2009). Ukrainian name Odesa. A city in southwestern Texas, an oil industry center (with its neighbor Midland) in the Permian Basin; population 98,801 (est. 2008).
    Odinthe supreme god and creator in Norse mythology
    OdinismThe worship of Odin, the supreme god and creator in Scandinavian mythology; the mythology and religious doctrine of the ancient Scandinavians, before the introduction of Christianity.
    OdysseusThe king of Ithaca and central figure of the Odyssey, renowned for his cunning and resourcefulness.
    odalisqueA female slave or concubine in a harem, especially one in the seraglio of the Sultan of Turkey.
    odalisquesA female slave or concubine in a harem, especially one in the seraglio of the Sultan of Turkey.
    oddDifferent from what is usual or expected; strange. (of whole numbers such as 3 and 5) having one left over as a remainder when divided by two. attributiveSeparated from a usual pair or set and therefore out of place or mismatched.
    oddballA strange or eccentric person. Strange; bizarre.
    oddballsA strange or eccentric person. Strange; bizarre.
    odditiesA strange or peculiar person, thing, or trait.
    oddityA strange or peculiar person, thing, or trait.
    oddmentA remnant or part of something, typically left over from a larger piece or set.
    oddsthe probability that one thing is so or will happen rather than another
    odeA lyric poem in the form of an address to a particular subject, often elevated in style or manner and written in varied or irregular meter.
    odesA lyric poem in the form of an address to a particular subject, often elevated in style or manner and written in varied or irregular meter.
    odeums(especially in ancient Greece or Rome) a building used for musical performances.
    odiousnessarousing or deserving hatred or repugnance
    odiumGeneral or widespread hatred or disgust directed toward someone as a result of their actions.
    odometerAn instrument for measuring the distance traveled by a vehicle.
    odometersAn instrument for measuring the distance traveled by a vehicle.
    odometryMeasurement by an odometer of distances travelled.
    odontoblastA cell in the pulp of a tooth that produces dentin.
    odontographAn instrument for marking or setting out the teeth of gearwheels so that they mesh accurately.
    odontoliteFossil tooth or bone coloured blue by mineral impregnation; bone turquoise.
    odontologyThe scientific study of the structure and diseases of teeth.
    odorA distinctive smell, especially an unpleasant one. A lingering quality, impression, or feeling attaching to something.
    odoriferousnessThe quality or condition of being odoriferous; fragrance.
    odyla force or natural power formerly held by some to reside in certain individuals and things and to underlie hypnotism and magnetism and some other phenomena
    odylesOd.
    odysseyA long and eventful or adventurous journey or experience. A Greek hexameter epic poem traditionally ascribed to Homer, describing the travels of Odysseus during his ten years of wandering after the fall of Troy. He eventually returned home to Ithaca and killed the suitors who had plagued his wife Penelope during his absence.
    odysseysA long and eventful or adventurous journey or experience. A Greek hexameter epic poem traditionally ascribed to Homer, describing the travels of Odysseus during his ten years of wandering after the fall of Troy. He eventually returned home to Ithaca and killed the suitors who had plagued his wife Penelope during his absence.
    OdelstingOdenseOdette
    OdinistOdinistsodd-jobman
    oddmentsoddnessodeum
    odiumsodontalgiaodontoblasts
    odontogenyodontoglossumodontoglossums
    odontographsodontographyodontolites
    odontophoreodontophorusodour
    odoursodylism

    26 Nouns That Start With OE

    OedipusThe son of Jocasta and of Laius, king of Thebes.
    OenoneA nymph of Mount Ida and lover of Paris, who deserted her for Helen.
    oedemaA condition characterized by an excess of watery fluid collecting in the cavities or tissues of the body.
    oeil-de-boeufA small round window.
    oeilladeA glance of the eye; a meaningful or knowing look, especially an amorous look, an ogle.
    oeilladesA glance of the eye; a meaningful or knowing look, especially an amorous look, an ogle.
    oenologista science that deals with wine and wine making
    oenologistsa science that deals with wine and wine making
    oenologyThe study of wines.
    oenomelSomething (especially thought, language, etc. ) in which strength and sweetness are combined.
    oenophileA connoisseur of wines.
    oenophilesA connoisseur of wines.
    oerstedA unit of magnetic field strength equivalent to 79. 58 amperes per meter.
    oerstedsA unit of magnetic field strength equivalent to 79. 58 amperes per meter.
    oesophagusThe part of the alimentary canal that connects the throat to the stomach; the gullet. In humans and other vertebrates it is a muscular tube lined with mucous membrane.
    oestradiolA major estrogen produced in the ovaries.
    oestrogenAny of a group of steroid hormones which promote the development and maintenance of female characteristics of the body. Such hormones are also produced artificially for use in oral contraceptives or to treat menopausal and menstrual disorders.
    oestrogensany of various natural steroids (such as estradiol) that are formed from androgen precursors, that are secreted chiefly by the ovaries, placenta, adipose tissue, and testes, and that stimulate the development of female secondary sex characteristics and promote the growth and maintenance of the female reproductive system
    oestrusA recurring period of sexual receptivity and fertility in many female mammals; heat.
    oestrusesa regularly recurrent state of sexual receptivity during which the female of most mammals will accept the male and is capable of conceiving
    oeuvreThe works of a painter, composer, or author regarded collectively.
    oeuvresThe works of a painter, composer, or author regarded collectively.
    oecologyoedemasoenophilist
    oenophilists

    67 Nouns Starting With OF

    OffaOff. (died 796), king of Mercia 757–796. He organized the construction of Offa’s Dyke, a series of earthworks marking the traditional boundary between England and Wales.
    OffalyA county in the central part of the Republic of Ireland, in the province of Leinster; county town, Tullamore.
    OffenbachJacques 1819–1880 originally Jacob Eberst French composercity in southwest central Germany on the Main River east of Frankfurt am Mainpopulation113500
    offAway from the place in question; to or at a distance. So as to be removed or separated. Starting a journey or race; leaving. So as to bring to an end or be discontinued. (of an electrical appliance or power supply) not functioning or so as to cease to function. Having access to or possession of material goods or wealth to the extent specified. Moving away and often down from. Situated or leading in a direction away from (a main route or intersection)So as to be removed or separated from. attributivepredicativeattributiveBritish The half of the field (as divided lengthways through the pitch) toward which the batsman’s feet are pointed when standing to receive the ball. Kill; murder.
    off-dayA day’s vacation from work or school on what would normally be a working day.
    off-daysA day’s vacation from work or school on what would normally be a working day.
    off-licenceBritish
    off-whiteA white color with a gray or yellowish tinge.
    offalThe entrails and internal organs of an animal used as food.
    offalsThe entrails and internal organs of an animal used as food.
    offbeatUnconventional; unusual. Music Any of the normally unaccented beats in a bar.
    offenceA breach of a law or rule; an illegal act. Annoyance or resentment brought about by a perceived insult to or disregard for oneself or one’s standards or principles. The action of attacking someone or something.
    offencessomething that outrages the moral or physical senses
    offenderA person who commits an illegal act. A person or thing that offends, does something wrong, or causes problems.
    offendersA person who commits an illegal act. A person or thing that offends, does something wrong, or causes problems.
    offenseA breach of a law or rule; an illegal act. Annoyance or resentment brought about by a perceived insult to or disregard for oneself or one’s standards or principles. The action of attacking someone or something.
    offensessomething that outrages the moral or physical senses
    offensiveCausing someone to feel deeply hurt, upset, or angry. attributiveAn attacking military campaign.
    offensivesCausing someone to feel deeply hurt, upset, or angry. attributiveAn attacking military campaign.
    offerPresent or proffer (something) for (someone) to accept or reject as so desired. An expression of readiness to do or give something if desired.
    offererone that offers
    offerersone that offers
    offeringA thing offered, especially as a gift or contribution.
    offeringsA thing offered, especially as a gift or contribution.
    offerorone that offers
    offerorsone that offers
    offersPresent or proffer (something) for (someone) to accept or reject as so desired. An expression of readiness to do or give something if desired.
    offertoriesChristian Church Christian Church
    offertoryChristian Church Christian Church
    officeA room, set of rooms, or building used as a place for commercial, professional, or bureaucratic work. A position of authority or service, typically one of a public nature. usually offices
    officerA person holding a position of command or authority in the armed services, in the merchant marine, or on a passenger ship. A holder of a public, civil, or ecclesiastical office. A member of a certain grade in some honorary orders. Provide with military officers.
    officersA person holding a position of command or authority in the armed services, in the merchant marine, or on a passenger ship. A holder of a public, civil, or ecclesiastical office. A member of a certain grade in some honorary orders. Provide with military officers.
    officesA room, set of rooms, or building used as a place for commercial, professional, or bureaucratic work. A position of authority or service, typically one of a public nature. usually offices
    officialRelating to an authority or public body and its duties, actions, and responsibilities. A person holding public office or having official duties, especially as a representative of an organization or government department.
    officialdomThe officials in an organization or government department, considered as a group.
    officialeseThe formal and typically verbose style of writing considered to be characteristic of official documents, especially when it is difficult to understand.
    officialsRelating to an authority or public body and its duties, actions, and responsibilities. A person holding public office or having official duties, especially as a representative of an organization or government department.
    officiantA person, typically a priest or minister, who performs a religious service or ceremony.
    officiantsA person, typically a priest or minister, who performs a religious service or ceremony.
    officiatingAct as an official in charge of something, as a sporting event.
    officiatorone that officiates
    officinal(of a herb or drug) standardly used in medicine.
    offingThe more distant part of the sea in view.
    offingsThe more distant part of the sea in view.
    offishnessstandoffish
    offprintA printed copy of an article that originally appeared as part of a larger publication.
    offprintsA printed copy of an article that originally appeared as part of a larger publication.
    offsAway from the place in question; to or at a distance. So as to be removed or separated. Starting a journey or race; leaving. So as to bring to an end or be discontinued. (of an electrical appliance or power supply) not functioning or so as to cease to function. Having access to or possession of material goods or wealth to the extent specified. Moving away and often down from. Situated or leading in a direction away from (a main route or intersection)So as to be removed or separated from. attributivepredicativeattributiveBritish The half of the field (as divided lengthways through the pitch) toward which the batsman’s feet are pointed when standing to receive the ball. Kill; murder.
    offsetA consideration or amount that diminishes or balances the effect of a contrary one. The amount or distance by which something is out of line. A side shoot from a plant serving for propagation. Architecture A bend in a pipe to carry it past an obstacle. often as modifierwith objectwith objectno object
    offsetsA consideration or amount that diminishes or balances the effect of a contrary one. The amount or distance by which something is out of line. A side shoot from a plant serving for propagation. Architecture A bend in a pipe to carry it past an obstacle. often as modifierwith objectwith objectno object
    offshootA side shoot or branch on a plant.
    offshootsA side shoot or branch on a plant.
    offside(especially in soccer or hockey) in a position where playing the ball or puck is not allowed, especially (in soccer) in the attacking half ahead of the ball and having fewer than two defenders nearer the goal line at the moment the ball is played. (especially in soccer or hockey) occupying or taking place in a position where playing the ball or puck is not allowed, especially (in soccer) in the attacking half ahead of the ball and having fewer than two defenders nearer the goal line at the moment the ball is played. The fact of being offside in soccer and other sports. usually the off side
    offsiderhelper, assistant, associate, follower
    offspringA person’s child or children.
    offspringsthe product of the reproductive processes of a person, animal, or plant
    offtakethe act of taking off
    offtakesthe act of taking off
    oftennessThe fact or condition of occurring often; frequency.
    off-licencesoffensivenessoffice-bearer
    office-bearersofficialismsofficiators
    officiousness

    21 Words That Start With OG Nouns

    OgadenA desert region in southeastern Ethiopia, largely inhabited by Somali nomads. It has been claimed by successive governments of neighboring Somalia.
    OgbomoshoA city and agricultural market in southwestern Nigeria, north of Ibadan; population 951,000 (est. 2007).
    OgpuAn organization for investigating and combating counterrevolutionary activities in the former Soviet Union, existing from 1922 (1922–3 as the GPU) to 1934 and replacing the Cheka. It was absorbed into the NKVD in 1934.
    ogamAn ancient British and Irish alphabet, consisting of twenty characters formed by parallel strokes on either side of or across a continuous line.
    ogamsAn ancient British and Irish alphabet, consisting of twenty characters formed by parallel strokes on either side of or across a continuous line.
    ogdoadA group or set of eight.
    ogdoadsA group or set of eight.
    ogeeHaving a double continuous S-shaped curve. An S-shaped line or molding.
    ogeesHaving a double continuous S-shaped curve. An S-shaped line or molding.
    oghamAn ancient British and Irish alphabet, consisting of twenty characters formed by parallel strokes on either side of or across a continuous line.
    oghamsAn ancient British and Irish alphabet, consisting of twenty characters formed by parallel strokes on either side of or across a continuous line.
    ogiveArchitecture Statistics
    ogivesArchitecture Statistics
    ogleStare at in a lecherous manner. A lecherous look.
    oglerto glance with amorous invitation or challenge
    oglersto glance with amorous invitation or challenge
    oglesStare at in a lecherous manner. A lecherous look.
    ogre(in folklore) a man-eating giant.
    ogres(in folklore) a man-eating giant.
    ogressA female ogre.
    ogressesA female ogre.

    6 Nouns Beginning With OH

    OhioA state in the northeastern US, bordering on Lake Erie; population 11,485,910 (est. 2008); capital, Columbus. Acquired by Britain from France in 1763 and by the US in 1783, it became the 17th state of the US in 1803.
    ohmThe SI unit of electrical resistance, expressing the resistance in a circuit transmitting a current of one ampere when subjected to a potential difference of one volt.
    ohmageElectrical resistance as expressed in ohms.
    ohmmeterAn instrument for measuring electrical resistance.
    ohmmetersAn instrument for measuring electrical resistance.
    ohmsOn Her (or His) Majesty’s Service.

    24 Nouns That Start With OI

    Oiseriver 188 miles (302 kilometers) long in northern France flowing southwest into the Seine River
    OistrakhDavid Fyodorovich 1908–1974 Russian violinist
    oidiumBotany A fungal disease affecting vines, caused by a powdery mildew.
    oikAn uncouth or obnoxious person.
    oiksAn uncouth or obnoxious person.
    oilA viscous liquid derived from petroleum, especially for use as a fuel or lubricant. often oilsLubricate, coat, or impregnate with oil. Supply with oil as fuel.
    oilcanA can containing lubricating oil, especially one with a long nozzle.
    oilcansA can containing lubricating oil, especially one with a long nozzle.
    oilclothFabric treated on one side with oil to make it waterproof.
    oilclothsFabric treated on one side with oil to make it waterproof.
    oilerAn oil tanker. A person who oils machinery. oilers
    oilersAn oil tanker. A person who oils machinery. oilers
    oilinessof, relating to, or consisting of oil
    oilmanAn owner or employee of an oil company.
    oilpaperPaper made transparent or waterproof by treatment with oil.
    oilsA viscous liquid derived from petroleum, especially for use as a fuel or lubricant. often oilsLubricate, coat, or impregnate with oil. Supply with oil as fuel.
    oilskinHeavy cotton cloth waterproofed with oil.
    oilskinsan oiled waterproof cloth used for coverings and garments
    oilstoneA fine-grained flat stone used with oil for sharpening cutting edges.
    oilstonesA fine-grained flat stone used with oil for sharpening cutting edges.
    ointmentA smooth oily preparation that is rubbed on the skin for medicinal purposes or as a cosmetic.
    ointmentsA smooth oily preparation that is rubbed on the skin for medicinal purposes or as a cosmetic.
    oiticicaAny of several tropical South American trees, especially Licania rigida (family Chrysobalanaceae), whose crushed seeds yield a drying oil used in paints and varnishes.
    oiticicasAny of several tropical South American trees, especially Licania rigida (family Chrysobalanaceae), whose crushed seeds yield a drying oil used in paints and varnishes.

    2 Nouns Starting With OJ

    OjibwaA member of a North American people of the region around Lake Superior. The Algonquian language of the Ojibwa. Relating to the Ojibwa or their language.
    OjibwasA member of a North American people of the region around Lake Superior. The Algonquian language of the Ojibwa. Relating to the Ojibwa or their language.

    14 Words That Start With OK Nouns

    OkavangoA river in southwestern Africa that rises in central Angola and flows 1,000 miles (1,600 km) south and then east to Namibia, where it turns east to form part of the border between Angola and Namibia before entering Botswana, where it drains into the extensive Okavango marshes.
    OkayamaAn industrial city and major railway junction in southwestern Japan, on the southwestern coast of the island of Honshu; population 683,258 (2007).
    OkinawaAn island in southern Japan, the largest of the Ryukyu Islands; chief town, Naha. An important World War II battle here in 1945 allowed the victorious Allies to establish bases close to the Japanese mainland.
    OklahomaA state in the southern central US, north of Texas; population 3,642,361 (est. 2008); capital, Oklahoma City. Acquired from the French as part of the Louisiana Purchase in 1803, it became the 46th state of the US in 1907.
    okaAn Egyptian and former Turkish unit of weight, variable but now usually equal to approximately 1. 3 kg (23/4 lb). An Egyptian and former Turkish unit of capacity equal to approximately 0. 2 liter (1/3 pint).
    okapiA large browsing mammal of the giraffe family that lives in the rainforests of northern Democratic Republic of Congo (Zaire). It has a dark chestnut coat with stripes on the hindquarters and upper legs.
    okapisA large browsing mammal of the giraffe family that lives in the rainforests of northern Democratic Republic of Congo (Zaire). It has a dark chestnut coat with stripes on the hindquarters and upper legs.
    okasAn Egyptian and former Turkish unit of weight, variable but now usually equal to approximately 1. 3 kg (23/4 lb). An Egyptian and former Turkish unit of capacity equal to approximately 0. 2 liter (1/3 pint).
    okayUsed to express assent, agreement, or acceptance. Satisfactory but not exceptionally or especially good. In a satisfactory manner or to a satisfactory extent. An authorization or approval. Sanction or give approval to. Oklahoma (in official postal use).
    okaysUsed to express assent, agreement, or acceptance. Satisfactory but not exceptionally or especially good. In a satisfactory manner or to a satisfactory extent. An authorization or approval. Sanction or give approval to. Oklahoma (in official postal use).
    okeSouth African
    okesSouth African
    okraA plant of the mallow family with long ridged seedpods, native to the Old World tropics.
    okrasa tall annual herb (Abelmoschus esculentus) of the mallow family that is cultivated for its mucilaginous green pods used especially in soups or stews

    82 Nouns Beginning With OL

    OlafThe name of five kings of Norway.
    Oligochaetaa class or in former classifications an order of Chaetopoda comprising hermaphroditic terrestrial and aquatic annelids distinguished from the polychaetes by possession of compact localized gonads and simple direct life histories without formation of a trochophore and by lack of parapodia and head specialization — see archioligochaeta , neoligochaeta
    oldieAn old song, film, or television program that is still well known or popular.
    oldsAn Oldsmobile car, especially a large family saloon model.
    oligarchsA ruler in an oligarchy. (especially in Russia) a very rich business leader with a great deal of political influence.
    olioA highly spiced stew of various meats and vegetables originating from Spain and Portugal. A miscellaneous collection of things.
    ollaA palm leaf, especially a leaf or strip of a leaf of the palmyra, traditionally used in Southern India and Sri Lanka for writing on.
    OldenburgOldhamOlea
    OlgaOligoceneOlivia
    OlivierOllieOlwen
    OlympiaOlympiadOlympiads
    OlympianOlympiansOlympus
    oldold-fashionedold-fashionedness
    old-timerold-timersoldies
    oldnessoldsteroldsters
    oleaginousnessoleanderoleanders
    oleariaoleariasoleaster
    oleastersoleateoleates
    olecranonolecranonsolefin
    olefineolefinesolefins
    oleinsoleooleograph
    oleographsoleographyoleomargarine
    oleosoleumolfaction
    olfactoryolibanumoligarch
    oligarchiesoligarchyoligochaete
    oligochaetesoligoclaseoligopolies
    oligopolyoligopsoniesoligopsony
    oliguriaoliosolive
    oliveniteolivesolivine
    olla-podridaollasolm
    olmsologyoloroso
    olorososolympics

    51 Nouns That Start With OM

    Omaghdistrict of western Northern Ireland, established in 1974 area 436 square miles (1134 square kilometers), population51000town in central Omagh district of western Northern Ireland population19000
    OmahaA city in eastern Nebraska, on the Missouri River; population 438,646 (est. 2008). A member of a North American people of northeastern Nebraska. The Siouan language of the Omaha. Relating to the Omaha or their language.
    OmanA country at the eastern corner of the Arabian peninsula; population 4,500,000 (estimated 2015); capital, Muscat; language, Arabic (official).
    Omarrubaiyat stanza
    OmayyadA member of a Muslim dynasty that ruled the Islamic world from AD 660 (or 661) to 750 and Moorish Spain from 756 to 1031. The dynasty claimed descent from Umayya, a distant relative of Muhammad. Relating to the Umayyad dynasty.
    OmdurmanA city in central Sudan, on the Nile River opposite Khartoum; population 3,151,600 (est. 2007).
    OmskA city in south central Russia, on the Irtysh River; population 1,131,100 (est. 2008).
    omadhaunfool, idiot, simpleton
    omadhaunsfool, idiot, simpleton
    omasumThe muscular third stomach of a ruminant animal, between the reticulum and the abomasum.
    ombreA trick-taking card game for three people using a pack of forty cards, popular in Europe in the 17th–18th centuries. Having tones of color that shade into each other, graduating from light to dark.
    ombuA large evergreen tree, Phytolacca dioica (family Phytolaccaceae), having a thick trunk with spreading buttresses at its base, native to South America and planted elsewhere as a shade tree. Also “ombú tree”.
    ombudsmanAn official appointed to investigate individuals’ complaints against maladministration, especially that of public authorities.
    ombusa large herbaceous South American tree (Phytolacca dioica) having an immensely broad trunk, soft spongy wood, and dark green oval leaves
    omegaThe twenty-fourth, and last, letter of the Greek alphabet (Ω, ω), transliterated as ‘o’ or ‘ō. ’. Ohm(s)
    omegasThe twenty-fourth, and last, letter of the Greek alphabet (Ω, ω), transliterated as ‘o’ or ‘ō. ’. Ohm(s)
    omeletA dish of beaten eggs cooked in a frying pan until firm, often with a filling added while cooking, and usually served folded over.
    omeletsbeaten eggs cooked without stirring until set and served folded in half
    omeletteA dish of beaten eggs cooked in a frying pan until firm, often with a filling added while cooking, and usually served folded over.
    omelettesbeaten eggs cooked without stirring until set and served folded in half
    omenAn event regarded as a portent of good or evil.
    omensAn event regarded as a portent of good or evil.
    omentumA fold of peritoneum connecting the stomach with other abdominal organs.
    omerAn ancient Hebrew dry measure, the tenth part of an ephah. Omer
    omersAn ancient Hebrew dry measure, the tenth part of an ephah. Omer
    omicronThe fifteenth letter of the Greek alphabet (Ο, ο), transliterated as ‘o. ’.
    omicronsThe fifteenth letter of the Greek alphabet (Ο, ο), transliterated as ‘o. ’.
    omissionA person or thing that has been left out or excluded.
    omissionsA person or thing that has been left out or excluded.
    ommatidiumEach of the optical units that make up a compound eye, as of an insect.
    ommatophoreA part of an invertebrate animal, especially a stalk or tentacle, that bears an eye.
    ommatophoresA part of an invertebrate animal, especially a stalk or tentacle, that bears an eye.
    omnibusA volume containing several novels or other items previously published separately. dated Comprising several items.
    omnibusesA volume containing several novels or other items previously published separately. dated Comprising several items.
    omnipotenceThe quality of having unlimited or very great power.
    omnipotencesThe quality of having unlimited or very great power.
    omnipotent(of a deity) having unlimited power; able to do anything. God.
    omnipresenceThe state of being widespread or constantly encountered.
    omniscienceThe state of knowing everything.
    omnium-gatherumA collection of miscellaneous people or things.
    omnivoreAn animal or person that eats food of both plant and animal origin.
    omnivoresAn animal or person that eats food of both plant and animal origin.
    omnivorousnessfeeding on both animal and vegetable substances
    omophagiaThe eating of raw food, especially raw meat.
    omophorionA vestment worn by patriarchs and bishops, corresponding to and resembling the pallium of the Latin Church.
    omophorionsA vestment worn by patriarchs and bishops, corresponding to and resembling the pallium of the Latin Church.
    omphalosliterary
    Omayyadsomberominousness
    omphaloses

    80 Nouns Starting With ON

    OneidaA member of an Iroquoian people formerly inhabiting upper New York State, one of the five peoples comprising the original Iroquois confederacy. The Iroquoian language of the Oneida. Relating to the Oneida or their language.
    onagerAn animal of a race of the Asian wild ass native to northern Iran.
    oncogenea gene having the potential to cause a normal cell to become cancerous
    oncologistA medical practitioner qualified to diagnose and treat tumors.
    onerA remarkable person or thing.
    onesReferring to a person or thing previously mentioned or easily identified. A person of a specified kind. third person singular
    onionsAn edible bulb with a pungent taste and smell, composed of several concentric layers, used in cooking. The plant that produces the onion, with long rolled or straplike leaves and spherical heads of greenish-white flowers.
    onrushA surging rush forward.
    onsetThe beginning of something, especially something unpleasant.
    onsetsThe beginning of something, especially something unpleasant.
    OnassisOneidasOnondaga
    OnondagasOntarioonagers
    onanismonanistonanists
    onceonce-overoncer
    oncersonchocerciasisoncidium
    oncidiumsoncogenesoncologists
    oncologyoncomingoncomings
    oncostoncostsondatra
    ondatrasondineondines
    ondingondingsone
    one-acterone-linerone-liners
    one-nighterone-nightersone-off
    one-offsone-sidednessone-step
    one-stepsone-twoone-upmanship
    oneirocriticoneirocriticismoneiromancy
    onenessonerousnessoners
    oniononlookeronlookers
    onomasticononomasticonsonomastics
    onomatopoeiaonomatopoeiasonrushes
    onslaughtonslaughtsontogenesis
    ontogenyontologistontologists
    ontologyonusonuses
    onychiaonychiumonyx
    onyxes

    40 Words That Start With OO Nouns

    oocyteA cell in an ovary which may undergo meiotic division to form an ovum.
    oodlesA very great number or amount of something.
    ooliteGeology
    oologyThe study or collecting of birds’ eggs.
    oolongA dark-colored China tea made by fermenting the withered leaves to about half the degree usual for black teas.
    oompahUsed to refer to the rhythmical sound of deep-toned brass instruments in a band. Make an ‘oompah’
    oomphThe quality of being exciting, energetic, or sexually attractive.
    ooseFluff from wool, cotton, etc.
    oosesFluff from wool, cotton, etc.
    OonaOonaghOostende
    oocytesoofoofs
    oogamyoogenesisoogonium
    oolitesoolithooliths
    oolongsoomiakoomiaks
    oompahsoophorectomiesoophorectomy
    oophoritisoophyteoophytes
    oosoospermoosperms
    oosphereoospheresoospore
    oosporesoozeoozes
    oozing

    159 Nouns Beginning With OP

    Ophir(in the Bible) an unidentified region, perhaps in southeastern Arabia, famous for its fine gold and precious stones.
    opahA large deep-bodied fish with a deep blue back, silvery belly, and crimson fins, living in deep oceanic waters.
    opinionsa view, judgment, or appraisal formed in the mind about a particular matter
    opossumAn American marsupial which has a naked prehensile tail and hind feet with an opposable thumb.
    opsinformal Observation post. (in the theater) opposite prompt. Organophosphate(s). (in the Roman Catholic Church) Ordo Praedicatorum Order of Preachers (Dominican). (in online forums or comment pages) original post (or poster).
    opticRelating to the eye or vision. A lens or other optical component in an optical instrument. archaic, humorous
    OpheliaOphiuchusOporto
    Oppenheimeropacitiesopacity
    opahsopalopalescence
    opalineopalinesopals
    opaquenessopaquesopcode
    opcodesopenopen-heartedness
    open-mindednessopenersopening
    openingsopennessopens
    openworkopepeopepes
    operaoperabilityoperagoer
    operagoersoperandoperands
    operantoperantsoperas
    operationoperationsoperative
    operativenessoperativesoperator
    operatorsoperculumoperetta
    operettasoperettistoperettists
    operonoperonsoperoseness
    ophicleideophicleidesophidian
    ophidiansophiolaterophiolaters
    ophiolatryophiologistophiologists
    ophiologyophiteophites
    ophthalmiaophthalmitisophthalmologist
    ophthalmologyophthalmometerophthalmometers
    ophthalmometryophthalmoscopeophthalmoscopes
    ophthalmoscopyopiateopiates
    opinicusopinicusesopinion
    opinionativenessopisthobranchopisthobranchs
    opisthodomosopisthodomosesopium
    opiumismopiumsopodeldoc
    opopanaxopossumsoppidan
    oppidansoppilationopponencies
    opponencyopponentopponents
    opportunenessopportunismopportunist
    opportunistsopportunitiesopportunity
    opposabilityopposeropposers
    oppositeoppositenessopposites
    oppositionoppositionsoppression
    oppressionsoppressivenessoppressor
    oppressorsopprobriousnessopprobrium
    oppugneroppugnersopsimath
    opsimathsopsoninoptative
    optativesopticianopticians
    opticsoptimeoptimes
    optimiseoptimisesoptimism
    optimistoptimistsoptimization
    optimizationsoptimumoption
    optionsoptometeroptometers
    optometristoptometristsoptometry
    opulenceopuntiaopuntias
    opusopusculeopuscules
    opuses

    339 Nouns That Start With OR

    OranA port on the Mediterranean coast of Algeria; population 679,900 (est. 2009).
    OregonA state in the northwestern US, on the coast of the Pacific Ocean; population 3,790,060 (est. 2008); capital, Salem. Britain ceded the territory to the US in 1846 and it became the 33rd state in 1859.
    OrestesThe son of Agamemnon and Clytemnestra and the brother of Electra and Iphigenia. He killed his mother and her lover Aegisthus to avenge the murder of Agamemnon.
    Origen(c. 185–c. 254), Christian scholar and theologian, probably born in Alexandria, Egypt. His most well-known work was the Hexapla, an edition of the Old Testament with six or more parallel versions.
    OrinocoA river in northern South America that rises in southeastern Venezuela and flows 1,280 miles (2,060 km), entering the Atlantic Ocean through a vast delta. For part of its length it forms the border between Colombia and Venezuela.
    OrionGreek Mythology Astronomy postpositive
    OrlandoA city in central Florida; population 230,519 (est. 2008). It is a popular tourist resort.
    OrlonA synthetic acrylic fiber used for textiles and knitwear, or a fabric made from it.
    OrneOrnate, ornamental. Chiefly as postpositive, especially in cottage orné.
    OrpheusA poet who could entrance wild beasts with the beauty of his singing and lyre playing. He went to the underworld after the death of his wife Eurydice and secured her release from the dead, but lost her because he failed to obey the condition that he must not look back at her until they had reached the world of the living.
    OrphismA mystic religion of ancient Greece, originating in the 7th or 6th century BC and based on poems (now lost) attributed to Orpheus, emphasizing the necessity for individuals to rid themselves of the evil part of their nature by ritual and moral purification throughout a series of reincarnations. A short-lived art movement (c. 1912) within cubism, pioneered by a group of French painters (including Robert Delaunay, Sonia Delaunay-Terk, and Fernand Léger) and emphasizing the lyrical use of color rather than the austere intellectual cubism of Picasso, Braque, and Gris.
    OrvietoA town in Umbria, in central Italy in the middle of a wine-producing area; population 21,059 (2008). A white wine made near Orvieto.
    orachA plant of the goosefoot family with leaves that are sometimes covered in a white mealy substance. Several kinds are edible and can be used as a substitute for spinach or sorrel.
    oracheA plant of the goosefoot family with leaves that are sometimes covered in a white mealy substance. Several kinds are edible and can be used as a substitute for spinach or sorrel.
    orachesA plant of the goosefoot family with leaves that are sometimes covered in a white mealy substance. Several kinds are edible and can be used as a substitute for spinach or sorrel.
    orachsA plant of the goosefoot family with leaves that are sometimes covered in a white mealy substance. Several kinds are edible and can be used as a substitute for spinach or sorrel.
    oracleA priest or priestess acting as a medium through whom advice or prophecy was sought from the gods in classical antiquity. archaic
    oraclesA priest or priestess acting as a medium through whom advice or prophecy was sought from the gods in classical antiquity. archaic
    oracyThe ability to express oneself fluently and grammatically in speech.
    oralBy word of mouth; spoken rather than written. Relating to the mouth. often orals
    oralsBy word of mouth; spoken rather than written. Relating to the mouth. often orals
    orangeA town in southern France, on the Rhône River, home of the ancestors of the Dutch royal house. A city in southwestern California, southeast of Los Angeles in an agricultural area; population 136,392 (est. 2008). Relating to the Orange Order. A round juicy citrus fruit with a tough bright reddish-yellow rind. A bright reddish-yellow color like that of the skin of a ripe orange. Reddish yellow.
    orarion#ERROR!
    orariumAn ecclesiastical stole; (now) specifically the stole worn by a deacon in the Greek and Russian Orthodox Churches.
    orationA formal speech, especially one given on a ceremonial occasion.
    oratorA public speaker, especially one who is eloquent or skilled.
    oratoryA small chapel, especially for private worship.The art or practice of formal speaking in public.
    oratrixA female plaintiff or petitioner. Now rare (chiefly US Law).
    orbA spherical body; a globe. literary
    orbitThe curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.A sphere of activity, interest, or application.Anatomy (of a celestial object or spacecraft) move in orbit around (a star or planet)
    orbitalRelating to an orbit or orbits.Each of the actual or potential patterns of electron density that may be formed in an atom or molecule by one or more electrons, and that can be represented as a wave function.
    orbitsThe curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.A sphere of activity, interest, or application.Anatomy (of a celestial object or spacecraft) move in orbit around (a star or planet)
    orbsA spherical body; a globe. literary
    orc(in fantasy literature and games) a member of an imaginary race of humanlike creatures, characterized as ugly, warlike, and malevolent.
    orceinA red dye obtained from orchil, used as a stain in microscopic study.
    orchardA piece of land planted with fruit trees.
    orchidA plant with complex flowers that are often showy or bizarrely shaped, having a large specialized lip (labellum) and frequently a spur. Orchids occur worldwide, especially as epiphytes in tropical forests, and are valuable hothouse plants.
    orchilA red or violet dye obtained from certain lichens, used as a source of litmus, orcinol, and other pigments.A lichen with flattened fronds from which a red or violet dye can be obtained.
    orchisAn orchid of (or formerly of) a genus native to north temperate regions, characterized by a tuberous root and an erect fleshy stem bearing a spike of typically purple or pinkish flowers.
    orcinolA crystalline compound extracted from certain lichens and used to make dyes.
    orcs(in fantasy literature and games) a member of an imaginary race of humanlike creatures, characterized as ugly, warlike, and malevolent.
    ordOrder.Ordinary.
    ordealA painful or horrific experience, especially a protracted one. historical
    orderThe arrangement or disposition of people or things in relation to each other according to a particular sequence, pattern, or method.An authoritative command, direction, or instruction.A particular social, political, or economic system.in singularBiology Any of the five classical styles of architecture (Doric, Ionic, Corinthian, Tuscan, and Composite) based on the proportions of columns, amount of decoration, etc.Military Mathematics reporting verbwith objectwith object
    ordersThe arrangement or disposition of people or things in relation to each other according to a particular sequence, pattern, or method.An authoritative command, direction, or instruction.A particular social, political, or economic system.in singularBiology Any of the five classical styles of architecture (Doric, Ionic, Corinthian, Tuscan, and Composite) based on the proportions of columns, amount of decoration, etc.Military Mathematics reporting verbwith objectwith object
    ordureExcrement; dung.
    oreA naturally occurring solid material from which a metal or valuable mineral can be profitably extracted.A monetary unit of Sweden, equal to one hundredth of a krona.
    oreadA nymph believed to inhabit mountains.
    oreadsA nymph believed to inhabit mountains.
    oresA naturally occurring solid material from which a metal or valuable mineral can be profitably extracted.A monetary unit of Sweden, equal to one hundredth of a krona.
    orexisAppetite; physical desire.
    organA part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.A department or organization that performs a specified function.
    organa(in medieval music) a form of early polyphony based on an existing plainsong.
    organsA part of an organism that is typically self-contained and has a specific vital function, such as the heart or liver in humans.A department or organization that performs a specified function.
    orgasmA climax of sexual excitement, characterized by feelings of pleasure centered in the genitals and (in men) experienced as an accompaniment to ejaculation.Experience an orgasm.
    orgeatA cooling drink made from orangeflower water and either barley or almonds.
    orgiesA wild party, especially one involving excessive drinking and unrestrained sexual activity.
    orgyA wild party, especially one involving excessive drinking and unrestrained sexual activity.
    oribiA small antelope of the African savanna, having a reddish-beige back, white underparts, and short vertical horns.
    oribisA small antelope of the African savanna, having a reddish-beige back, white underparts, and short vertical horns.
    orielA projection from the wall of a building, typically supported from the ground or by corbels.
    orielsA projection from the wall of a building, typically supported from the ground or by corbels.
    orientthe OrientThe special luster of a pearl of the finest quality. literary with objectAdjust or tailor (something) to specified circumstances or needs.
    origanAny plant of the genus Origanum; especially wild marjoram or oregano, O. vulgare. In early use also
    originThe point or place where something begins, arises, or is derived.Anatomy Mathematics
    orioleAn Old World bird related to the starlings that feeds on fruit and insects, the male typically having bright yellow and black plumage.A New World bird of the American blackbird family, with black and orange or yellow plumage.
    orisonA prayer.
    orleA narrow border inset from the edge of a shield.
    orlesA narrow border inset from the edge of a shield.
    orlopThe lowest deck of a wooden sailing ship with three or more decks.
    orlopsThe lowest deck of a wooden sailing ship with three or more decks.
    ormoluA gold-colored alloy of copper, zinc, and tin used in decorating furniture and making ornaments. The term originally referred to a process in which powdered gold was mixed with mercury and used to gild metal, a technique that was banned in the 19th century on account of its toxicity.
    ornisThe birds of a region collectively; = “avifauna”.
    oroideAn alloy of copper and zinc having the colour of gold.
    orphanA child whose parents are dead.Printing Make (a person or animal) an orphan.
    orpinFretting, murmuring.
    orpineA purple-flowered Eurasian plant of the stonecrop family, a naturalized weed of North America.
    orpinsA purple-flowered Eurasian plant of the stonecrop family, a naturalized weed of North America.
    orreryA mechanical model of the solar system, or of just the sun, earth, and moon, used to represent their relative positions and motions.
    orrisA preparation of the fragrant rootstock of an iris, used in perfumery and formerly in medicine.
    oryxAny of several species of antelopes native to arid regions of Africa and Asia, having dark markings on the face and long, pointed horns.
    oryxesAny of several species of antelopes native to arid regions of Africa and Asia, having dark markings on the face and long, pointed horns.
    orzoA variety of pasta shaped like grains of barley or rice.
    OrangeismOrangemanOrcadian
    OrcadiansOrcusOrczy
    OrdovicianOreopithecusOresteia
    OrfeoOrffOrientalism
    OrientalistOrientalistsOrigenism
    OrigenistOrigenistsOrissa
    OriyaOrleanismOrleanist
    OrlyOrmandyOrmazd
    OrpingtonOrsiniOrsino
    OrsonOrtonOrwell
    oracularityoracularnessorang
    orang-utanorang-utansorange-tip
    orangeadeorangeadesorangeries
    orangeryorangsorarions
    orariumsorationsoratories
    oratoriooratoriosoratrixes
    orbicularisorbitalsorchardist
    orchardistsorchardsorchestra
    orchestrasorchestrationorchestrations
    orchestratororchestratorsorchestrion
    orchestrionsorchidectomiesorchidectomy
    orchidologistorchidologistsorchidology
    orchidsorchiectomiesorchiectomy
    orchilsorchisesorchitis
    ordainerordainersordaining
    ordainmentordainmentsordeals
    orderingorderingsorderlies
    orderlinessordinalsordinance
    ordinancesordinandordinands
    ordinariesordinarinessordinary
    ordinateordinatesordination
    ordinationsordnanceordnances
    ordonnanceordsordures
    oreadesoreganooreganos
    orexisesorfeorfes
    organ-grinderorgan-grindersorgandie
    organdyorganelleorganelles
    organicorganicismorganicist
    organicistsorganisabilityorganisation
    organisationsorganismorganisms
    organistorganistsorganizability
    organizationorganizationsorganizer
    organizersorganogenesisorganography
    organonorganotherapyorganum
    organzaorganzasorganzine
    orgasmsorgeatsoriental
    orientalsorientationorientations
    orienteeringorientsorifice
    orificesoriflammeoriflammes
    origamioriganesorigans
    origanumoriganumsoriginal
    originalityoriginalsorigination
    originatororiginatorsorigins
    orinasalorinasalsorioles
    orisonsorleansormer
    ormersormolusornament
    ornamentalornamentationornamentations
    ornamentsornatenessorneriness
    ornisesornithischianornithischians
    ornithogalumornithogalumsornithologist
    ornithologistsornithologyornithomancy
    ornithopodornithopodsornithopter
    ornithoptersornithorhynchusornithoscopy
    ornithosisorogeniesorogeny
    orographicorographyorologist
    orologistsoropharynxorotundity
    orphanageorphanagesorphanhood
    orphansorpharionorpharions
    orphreyorphreysorpiment
    orpinesorreriesorrises
    orseilleorseillesortanique
    ortaniquesorthiconorthicons
    orthocentreorthocentresorthoclase
    orthodontiaorthodonticsorthodontist
    orthodontistsorthodoxiesorthodoxy
    orthoepyorthogenesisorthographer
    orthographersorthographiesorthography
    orthopaedicsorthopedicsorthopedist
    orthopedistsorthophosphateorthophosphates
    orthopraxiesorthopraxyorthopsychiatry
    orthopteraorthopteranorthopteron
    orthopticsorthostichiesorthostichy
    orthotoneorthotropismorthros
    orthrosesortolanortolans

    121 Nouns Starting With OS

    OsageA member of a North American people formerly inhabiting the Osage River valley in Missouri. The Siouan language of the Osage. Relating to the Osage or their language.
    OsagesA member of a North American people formerly inhabiting the Osage River valley in Missouri. The Siouan language of the Osage. Relating to the Osage or their language.
    OsakaA port and commercial city in central Japan, on the island of Honshu; population 2,510,459 (2007).
    OscanAn extinct Italic language of southern Italy, related to Umbrian and surviving in inscriptions mainly of the 4th to 1st centuries BC. Relating to Oscan.
    Oscartrademark in US A code word representing the letter O, used in radio communication. Money. A South American cichlid fish with velvety brown young and multicolored adults, popular in aquariums.
    OsirisA god originally connected with fertility, husband of Isis and father of Horus. He is known chiefly through the story of his death at the hands of his brother Seth and his subsequent restoration to a new life as ruler of the afterlife.
    OsloThe capital and chief port of Norway, on the southern coast at the head of Oslofjord; population 839,423 (2007). Founded in the 11th century, it was known as Christiania (or Kristiania) from 1624 until 1924 in honor of Christian IV of Norway and Denmark (1577–1648).
    OsmanliRelating to the Ottoman empire or to the Turkish dynasty of Osman I (Othman I). A Turk, especially of the period of the Ottoman empire.
    OsmanlisRelating to the Ottoman empire or to the Turkish dynasty of Osman I (Othman I). A Turk, especially of the period of the Ottoman empire.
    OssianA legendary Irish warrior and bard, whose name became well known in 1760–63 when the Scottish poet James Macpherson (1736–96) published his own verse as an alleged translation of 3rd-century Gaelic tales.
    Ossies(in Germany) a citizen of the former German Democratic Republic.
    OstendA port on the North Sea coast of northwestern Belgium, in West Flanders; population 69,175 (2008). It is a major ferry port with links to Dover. French name Ostende.
    OstrogothA member of the eastern branch of the Goths, who conquered Italy in the 5th–6th centuries AD.
    OstyakA member of a people of the Ob River basin in Western Siberia. Now usually called Khanty. The Ob-Ugrian language of this people; = “Khanty”. Of, relating to, or designating the Ostyaks or their language.
    oscillationMovement back and forth at a regular speed. Physics
    oscillationsMovement back and forth at a regular speed. Physics
    oscillatorA device for generating oscillatory electric currents or voltages by nonmechanical means.
    oscillatorsA device for generating oscillatory electric currents or voltages by nonmechanical means.
    oscillogramA record produced by an oscillograph.
    oscillogramsA record produced by an oscillograph.
    oscillographA device for recording oscillations, especially those of an electric current.
    oscilloscopeA device for viewing oscillations, as of electrical voltage or current, by a display on the screen of a cathode ray tube.
    oscineRelating to or denoting passerine birds of a large division that includes the songbirds. A bird of the oscine division.
    oscitancyDrowsiness as evidenced by yawning; dullness; indolence, negligence, inattention.
    osculumA large aperture in a sponge through which water is expelled.
    osierA small Eurasian willow that grows mostly in wet habitats and is a major source of the long flexible shoots (withies) used in basketwork. US
    osiersA small Eurasian willow that grows mostly in wet habitats and is a major source of the long flexible shoots (withies) used in basketwork. US
    osmeteriumAn organ capable of emitting a penetrating or noxious odour; specifically an eversible gland on the first thoracic segment of certain papilionid caterpillars.
    osmiridiumA naturally occurring alloy of osmium and iridium, often with traces of other metals; (Mineralogy) an alloy having a cubic crystal structure and in which iridium predominates.
    osmiumThe chemical element of atomic number 76, a hard, dense silvery-white metal of the transition series.
    osmometerAn instrument for demonstrating or measuring osmotic pressure.
    osmometersAn instrument for demonstrating or measuring osmotic pressure.
    osmosePass by or as if by osmosis.
    osmosesPass by or as if by osmosis.
    osmosisBiology Chemistry The process of gradual or unconscious assimilation of ideas, knowledge, etc.
    osmundA plant of a genus that includes the royal and cinnamon ferns.
    osmundaA plant of a genus that includes the royal and cinnamon ferns.
    osmundasA plant of a genus that includes the royal and cinnamon ferns.
    osmundsA plant of a genus that includes the royal and cinnamon ferns.
    osnaburgA kind of coarse, heavy linen or cotton used for such items as furnishings and sacks.
    osnaburgsA kind of coarse, heavy linen or cotton used for such items as furnishings and sacks.
    ospreyA large fish-eating bird of prey with long, narrow wings and a white underside and crown, found throughout the world.
    ospreysA large fish-eating bird of prey with long, narrow wings and a white underside and crown, found throughout the world.
    ossaA bone (used chiefly in Latin names of individual bones, e. g. os trapezium). An opening or entrance to a passage, especially one at either end of the cervix of the uterus. The chemical element osmium. (in calculating dates) Old Style. Computing Ordinary Seaman. (in the UK) Ordnance Survey. (as a size of clothing) outsize. Out of stock. Overseas.
    osseinThe collagen of bones, used for glues and gelatin, derived by dissolving the mineral content in an acid solution.
    osseletZoology Anatomy rare Medicine
    osseletsZoology Anatomy rare Medicine
    ossicleAnatomy Zoology
    ossiclesAnatomy Zoology
    ossifrageA bird of prey reputed to break bones by dropping them from a great height (usually identified with the lammergeier or bearded vulture, Gypaetus barbatus).
    ossifragesA bird of prey reputed to break bones by dropping them from a great height (usually identified with the lammergeier or bearded vulture, Gypaetus barbatus).
    ossuariesA container or room in which the bones of dead people are placed.
    ossuaryA container or room in which the bones of dead people are placed.
    osteitisInflammation of the substance of a bone.
    ostentationPretentious and vulgar display, especially of wealth and luxury, intended to impress or attract notice.
    osteoblastA cell that secretes the matrix for bone formation.
    osteoblastsA cell that secretes the matrix for bone formation.
    osteoclasisSurgery Pathology Physiology
    osteoclastA large multinucleate bone cell which absorbs bone tissue during growth and healing.
    osteoclastsA large multinucleate bone cell which absorbs bone tissue during growth and healing.
    osteogenesisThe formation of bone.
    osteologyThe study of the structure and function of the skeleton and bony structures.
    osteomaA tumour of bone; specifically a well-circumscribed benign tumour composed of compact or trabecular bone, usually occurring in a bone of the skull.
    osteomalaciaSoftening of the bones, typically through a deficiency of vitamin D or calcium.
    osteomasA tumour of bone; specifically a well-circumscribed benign tumour composed of compact or trabecular bone, usually occurring in a bone of the skull.
    osteopathA practitioner of osteopathy.
    osteopathistA practitioner of osteopathy; an osteopath.
    osteopathsA practitioner of osteopathy.
    osteopathyA branch of medical practice that emphasizes the treatment of medical disorders through the manipulation and massage of the bones, joints, and muscles.
    osteophyteA bony outgrowth associated with the degeneration of cartilage at joints.
    osteophytesA bony outgrowth associated with the degeneration of cartilage at joints.
    osteoplastyReparative or reconstructive surgery of the bones; bone grafting; an instance of this.
    osteoporosisA medical condition in which the bones become brittle and fragile from loss of tissue, typically as a result of hormonal changes, or deficiency of calcium or vitamin D.
    osteosarcomaA malignant tumor of bone in which there is a proliferation of osteoblasts.
    osteotomeA surgical instrument for cutting bone, typically resembling a chisel.
    osteotomesA surgical instrument for cutting bone, typically resembling a chisel.
    osteotomiesThe surgical cutting of a bone or removal of a piece of bone.
    osteotomyThe surgical cutting of a bone or removal of a piece of bone.
    ostiariesA doorkeeper, especially of a church; specifically a member of the lowest of the four lesser orders in the pre-Reformation Western Church, and later in the Roman Catholic Church.
    ostiaryA doorkeeper, especially of a church; specifically a member of the lowest of the four lesser orders in the pre-Reformation Western Church, and later in the Roman Catholic Church.
    ostinatoA continually repeated musical phrase or rhythm.
    ostinatosA continually repeated musical phrase or rhythm.
    ostiole(in some small algae and fungi) a small pore through which spores are discharged.
    ostioles(in some small algae and fungi) a small pore through which spores are discharged.
    ostiumAnatomy Zoology
    ostlerA man employed to look after the horses of people staying at an inn.
    ostraciseExclude (someone) from a society or group.
    ostracisesExclude (someone) from a society or group.
    ostracismExclusion from a society or group. (in ancient Greece) temporary banishment from a city by popular vote.
    ostracodA minute aquatic crustacean of the class Ostracoda.
    ostracodermAn extinct jawless fish of the Cambrian to Devonian periods, having a heavily armored body.
    ostracodsA minute aquatic crustacean of the class Ostracoda.
    ostraconA potsherd used as a writing surface.
    ostrichA flightless swift-running African bird with a long neck, long legs, and two toes on each foot. It is the largest living bird, with males reaching an average height of 8 feet (2. 5 m). A person who refuses to face reality or accept facts.
    ostrichesA flightless swift-running African bird with a long neck, long legs, and two toes on each foot. It is the largest living bird, with males reaching an average height of 8 feet (2. 5 m). A person who refuses to face reality or accept facts.
    OsbertOsborneOscars
    OsricOssieOswald
    oscillographsoscilloscopesosculation
    osculationsosculumsosmidrosis
    osmometryossificationostensories
    ostensoryostentatiousnessosteoarthritis
    osteologistosteologistsosteomyelitis
    osteopathistsosteopetrosisosteoplasties
    ostlers

    39 Words That Start With OT Nouns

    OthelloA trademark for
    OtisInflammation of the ear, usually distinguished as otitis externa (of the passage of the outer ear), otitis media (of the middle ear), and otitis interna (of the inner ear; labyrinthitis).
    Otrantocommune and port on the Strait of Otranto at the southeastern tip of Puglia in southern Italy population5600
    OttawaThe federal capital of Canada, in southeastern Ontario, on the Ottawa River (a tributary of the St. Lawrence River); population 812,129 (2006). From its founding in 1827 until 1854, it was named Bytown after Colonel John By (1779–1836).
    OttomanA low upholstered seat, or footstool, without a back or arms that typically serves also as a box, with the seat hinged to form a lid. A heavy ribbed fabric made from silk and either cotton or wool, typically used for coats. historical historical A Turk, especially of the period of the Ottoman Empire.
    OttomansA low upholstered seat, or footstool, without a back or arms that typically serves also as a box, with the seat hinged to form a lid. A heavy ribbed fabric made from silk and either cotton or wool, typically used for coats. historical historical A Turk, especially of the period of the Ottoman Empire.
    OtwayThomas 1652–1685 English dramatist
    otalgiaEarache.
    othernessThe quality or fact of being different.
    otherworldlinessof, relating to, or resembling that of a world other than the actual world
    otitisInflammation of the ear, usually distinguished as otitis externa (of the passage of the outer ear), otitis media (of the middle ear), and otitis interna (of the inner ear; labyrinthitis).
    otocysta fluid-containing organ of many invertebrates that contains an otolith
    otocystsa fluid-containing organ of many invertebrates that contains an otolith
    otolaryngologista physician specializing in otolaryngology
    otolaryngologistsa physician specializing in otolaryngology
    otolaryngologyThe study of diseases of the ear and throat.
    otolithEach of three small oval calcareous bodies in the inner ear of vertebrates, involved in sensing gravity and movement.
    otolithsEach of three small oval calcareous bodies in the inner ear of vertebrates, involved in sensing gravity and movement.
    otologista science that deals with the ear and its diseases
    otologistsa science that deals with the ear and its diseases
    otologyThe study of the anatomy and diseases of the ear.
    otorhinolaryngologista physician specializing in otorhinolaryngology
    otorhinolaryngologistsa physician specializing in otorhinolaryngology
    otorhinolaryngologya medical specialty concerned especially with the ear, nose, and throat and related parts of the head and neck
    otosclerosisA disorder, sometimes hereditary, in which there is formation of new bone around the base of the stapes (bone of the middle ear), resulting in progressive hearing loss.
    otoscopeAn instrument designed for visual examination of the eardrum and the passage of the outer ear, typically having a light and a set of lenses.
    otoscopesAn instrument designed for visual examination of the eardrum and the passage of the outer ear, typically having a light and a set of lenses.
    ottavaat an octave higher or lower than written
    otterA semiaquatic fish-eating mammal of the weasel family, with an elongated body, dense fur, and webbed feet.
    ottersA semiaquatic fish-eating mammal of the weasel family, with an elongated body, dense fur, and webbed feet.
    ottoa fragrant essential oil (as from rose petals)
    ottosA fragrant essential oil, typically made from rose petals.
    ottreliteA hydroxide and aluminosilicate of magnesium, ferrous iron, and manganese which occurs as greyish to black crystalline scales.
    OtelloOtterburnOttilie
    ottarottarsottavas

    184 Nouns Beginning With OU

    OudhA region of northern India. Joined with Agra in 1877, it formed the United Provinces of Agra and Oudh in 1902 and was renamed Uttar Pradesh in 1950.
    OuseA river in northeastern England that forms at the confluence of the Ure and Swale Rivers and flows southeast for 57 miles (92 km) through York to the Humber Estuary. A river in southeastern England that flows southeast for 30 miles (48 km) to the English Channel.
    ouabainA toxic compound obtained from certain trees, used as a very rapid cardiac stimulant. It is a polycyclic glycoside.
    ouchUsed to express pain.
    ouchesA clasp, buckle, fibula, or brooch, especially one set with precious stones, for holding together the two sides of a garment; (hence) a clasped necklace, bracelet, or the like. Also, in later use
    oughtUsed to indicate duty or correctness, typically when criticizing someone’s actions. Used to indicate something that is probable.
    ounceA very small amount of something.
    ouncesA very small amount of something.
    ouselA bird that resembles the blackbird, especially the ring ouzel.
    ouselsA bird that resembles the blackbird, especially the ring ouzel.
    ousterNorth American Law
    oustersNorth American Law
    oustingDrive out or expel (someone) from a position or place.
    outMoving or appearing to move away from a particular place, especially one that is enclosed or hidden. Situated far or at a particular distance from somewhere. Away from home. So as to be revealed or known. At or to an end. (of a light or fire) so as to be extinguished or no longer burning. (of a jury) considering its verdict in secrecy. Indicating a specified distance away from the goal line or finishing line. (of a party, politician, etc. ) not in office. Through to the outside. Not at home or at one’s place of work. Revealed or made public. No longer alight; extinguished. (of a book, recording, or other product) published or made available. Not concealing one’s sexuality or gender identity. At an end. In a state of unconsciousness. Mistaken; in error. Cricket Baseball informal Baseball the outsReveal the sexual or gender identity of (a person). dated West Indian archaic, literary
    outageA period when a power supply or other service is not available or when equipment is closed down.
    outagesA period when a power supply or other service is not available or when equipment is closed down.
    outbackThe remote and usually uninhabited inland regions of Australia.
    outcastA person who has been rejected by society or a social group. Rejected or cast out.
    outcomeThe way a thing turns out; a consequence.
    outcropA rock formation that is visible on the surface. Appear as an outcrop.
    outcryAn exclamation or shout.
    outerOutside; external.
    outersOutside; external.
    outfallThe place where a river, drain, or sewer empties into the sea, a river, or a lake.
    outfitA set of clothes worn together, typically for a particular occasion or purpose. Provide (someone) with a set of clothes.
    outfitsA set of clothes worn together, typically for a particular occasion or purpose. Provide (someone) with a set of clothes.
    outflowA large amount of money, liquid, or people that moves or is transferred out of a place.
    outgoThe outlay of money. Go faster than.
    outgoerA person who or animal that goes out; specifically a person who goes out of a place, office, occupation, or tenancy; (Cricket) a dismissed batsman (now rare).
    outhaulA rope used to haul out the clew of a boom sail or the tack of a jib.
    outingA trip taken for pleasure, especially one lasting a day or less. The act or practice of revealing the homosexuality of a person.
    outlandRemote or distant territory. Remote; distant.
    outlawA person who has broken the law, especially one who remains at large or is a fugitive. Ban or make illegal.
    outlayAn amount of money spent on something. Expend (an amount of money) on something.
    outletA pipe or hole through which water or gas may escape. A place from which goods are sold or distributed. A means of expressing one’s talents, energy, or emotions.
    outlierA person or thing situated away or detached from the main body or system.
    outlineA line or set of lines enclosing or indicating the shape of an object in a sketch or diagram. A general description or plan giving the essential features of something but not the detail. Draw, trace, or define the outer edge or shape of (something)Give a summary of (something)
    outlookA person’s point of view or general attitude to life. A view.
    outnessThe quality, fact, or condition of being out; the quality or fact of being external, especially as apprehended by the mind or senses; externality; an example or instance of this. Utterance, outward expression.
    outputThe amount of something produced by a person, machine, or industry. Electronics Produce, deliver, or supply (data) using a computer or other device.
    outsMoving or appearing to move away from a particular place, especially one that is enclosed or hidden. Situated far or at a particular distance from somewhere. Away from home. So as to be revealed or known. At or to an end. (of a light or fire) so as to be extinguished or no longer burning. (of a jury) considering its verdict in secrecy. Indicating a specified distance away from the goal line or finishing line. (of a party, politician, etc. ) not in office. Through to the outside. Not at home or at one’s place of work. Revealed or made public. No longer alight; extinguished. (of a book, recording, or other product) published or made available. Not concealing one’s sexuality or gender identity. At an end. In a state of unconsciousness. Mistaken; in error. Cricket Baseball informal Baseball the outsReveal the sexual or gender identity of (a person). dated West Indian archaic, literary
    outsetThe start or beginning of something.
    ouzelA bird that resembles the blackbird, especially the ring ouzel.
    ouzelsA bird that resembles the blackbird, especially the ring ouzel.
    ouzoA Greek anise-flavored liqueur.
    ouzosA Greek anise-flavored liqueur.
    OuagadougouOujdaouabains
    ouananicheouananichesoubliette
    oubliettesoughtsouija
    ouijasoupheourari
    ourarisout-and-outerout-of-doors
    out-of-printout-trayout-trays
    outboardoutbreakoutbreaks
    outbuildingoutbuildingsoutburst
    outburstsoutcasteoutcastes
    outcastsoutcomesoutcries
    outcroppingoutcropsoutcross
    outcrossesoutcrossingoutcrossings
    outdoorsouterwearoutfalls
    outfieldoutfielderoutfielders
    outfieldsoutfightingoutfitter
    outfittersoutfittingoutflows
    outgoersoutgoingoutgoings
    outgrowthoutgrowthsoutguard
    outguardsouthaulsouthouse
    outhousesoutlanderoutlanders
    outlandishnessoutlandsoutlawry
    outliersoutlinesoutlooks
    outparishoutparishesoutports
    outpostsoutpouringoutpourings
    outpoursoutputsoutquarters
    outrageoutrageousnessoutrages
    outranceoutrancesoutreach
    outreachesoutremeroutremers
    outrideoutrideroutriders
    outridesoutriggeroutriggers
    outrunneroutrunnersoutrush
    outrushesoutsetsoutshoot
    outshootsoutshotoutshots
    outsideoutsideroutsiders
    outsidesoutsizeoutsizes
    outskirtsoutsoleoutsoles
    outspanoutspansoutspokenness
    outspreadoutspreadsoutstation
    outstationsoutswingoutswinger
    outswingersoutswingsouttake
    outturnoutturnsoutward
    outwardnessoutwardsoutwash
    outworkoutworkeroutworkers
    outworks

    267 Nouns That Start With OV

    OvamboA member of a people of northern Namibia. The Bantu language of the Ovambo. Relating to the Ovambo or their language.
    OvambosA member of a people of northern Namibia. The Bantu language of the Ovambo. Relating to the Ovambo or their language.
    Ovid(43 BC–c. AD 17), Roman poet; full name Publius Ovidius Naso. He is noted for his elegiac love poems (such as the Amores and the Ars Amatoria) and for the Metamorphoses, a hexametric series of tales of mythological, legendary, and historical figures.
    OviedoA city in northwestern Spain, capital of the Asturias region; population 220,644 (2008).
    ovaA mature female reproductive cell, especially of a human or other animal, which can divide to give rise to an embryo usually only after fertilization by a male cell.
    ovalHaving a rounded and slightly elongated outline or shape like that of an egg. A body, object, or design with an oval shape or outline.
    ovalbuminAlbumin derived from the white of eggs.
    ovalsHaving a rounded and slightly elongated outline or shape like that of an egg. A body, object, or design with an oval shape or outline.
    ovariesA female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair.
    ovaryA female reproductive organ in which ova or eggs are produced, present in humans and other vertebrates as a pair.
    ovationA sustained and enthusiastic show of appreciation from an audience, especially by means of applause. Roman History
    ovationsA sustained and enthusiastic show of appreciation from an audience, especially by means of applause. Roman History
    ovenAn enclosed compartment, as in a kitchen range, for cooking and heating food.
    ovensAn enclosed compartment, as in a kitchen range, for cooking and heating food.
    ovenwareDishes that can be used for cooking food in the oven.
    overExtending directly upward from. At a higher level or layer than. Higher than or more than (a specified number or quantity)Expressing passage or trajectory across. Expressing duration. By means of; by the medium of. On the subject of. No longer affected by. Expressing passage or trajectory across an area. Beyond and falling or hanging from a point. Used to express action and result. Used to express repetition of a process. (in two-way radio communication) used to indicate that the speaker has finished speaking and is awaiting a reply. Finished or complete. A sequence of six balls bowled by a bowler from one end of the pitch.
    overallTaking everything into account. In all parts; taken as a whole. North American
    overallsTaking everything into account. In all parts; taken as a whole. North American
    overbid(in an auction) make a higher bid than a previous bid. (in competitive bidding, the auction in bridge, etc. ) bid more than is warranted or manageable. A bid that is higher than is justified.
    overbids(in an auction) make a higher bid than a previous bid. (in competitive bidding, the auction in bridge, etc. ) bid more than is warranted or manageable. A bid that is higher than is justified.
    overbiteThe overlapping of the lower teeth by the upper.
    overbuyBuy more of (something) than one needs.
    overbuysBuy more of (something) than one needs.
    overcallMake a higher bid than an opponent’s bid. An act or instance of making an overcall.
    overcast(of the sky or weather) marked by a covering of gray clouds; dull. (in sewing) edged with stitching to prevent fraying. Clouds covering a large part of the sky. Cover with clouds or shade. Stitch over (an unfinished edge) to prevent fraying.
    overcheckA check pattern superimposed on a color or design. A strap passing over a horse’s head between the ears, to pull up on the bit and make breathing easier.
    overcoatA long warm coat worn over other clothing. A top, final layer of paint or a similar covering.
    overdoseAn excessive and dangerous dose of a drug. Take an overdose of a drug.
    overdrivesan automotive transmission gear that transmits to the drive shaft a speed greater than engine speed
    overfallA turbulent stretch of open water caused by the wind blowing against a current, by a strong current or tide over an underwater ridge, or by a meeting of currents.
    overflow(especially of a liquid) flow over the brim of a receptacle. in singularComputing
    overfoldA part of something which is folded over another part.
    overhangHang or extend outward over. A part of something that sticks out or hangs over another thing.
    overhaulTake apart (a piece of machinery or equipment) in order to examine it and repair it if necessary. British A thorough examination of machinery or a system, with repairs or changes made if necessary.
    overheadAbove the level of the head; in the sky. Situated above the level of the head. (of a driving mechanism) above the object driven. attributiveAn overhead cost or expense. A transparency designed for use with an overhead projector. An overhead compartment.
    overheatMake or become too hot. no object
    overkillExcessive use, treatment, or action; too much of something. The amount by which destruction or the capacity for destruction exceeds what is necessary.
    overlapExtend over so as to cover partly. A part or amount which overlaps.
    overlapsExtend over so as to cover partly. A part or amount which overlaps.
    overlayCover the surface of (something) with a coating. (of a quality or feeling) become more prominent than (a previous quality or feeling)Something laid as a covering over something else. Computing
    overlaysCover the surface of (something) with a coating. (of a quality or feeling) become more prominent than (a previous quality or feeling)Something laid as a covering over something else. Computing
    overloadLoad with too great a burden or cargo. An excessive load or amount.
    overlookFail to notice (something)Have a view of from above. archaic archaic A commanding position or view.
    overlordA ruler, especially a feudal lord.
    overmanProvide with more people than necessary. An overseer. Philosophy
    overmansProvide with more people than necessary. An overseer. Philosophy
    overmastTo provide (a sailing ship) with too high or too heavy a mast or masts.
    overmuchToo much; excessively. Too great in amount; excessive. An excessive amount.
    overpassA bridge by which a road or railroad passes over another. Pass over; traverse.
    overplusA surplus or excess.
    overrideUse one’s authority to reject or cancel (a decision, view, etc. )Interrupt the action of (an automatic device), typically in order to take manual control. technical Travel or move over. A device for suspending an automatic function on a machine. An excess or increase on a budget, salary, or cost. mainly US
    overripeToo ripe; past its best.
    overrunSpread over or occupy (a place) in large numbers. Continue beyond or above an expected or allowed time or cost. An instance of something exceeding an expected or allowed time or cost. The movement or extension of something beyond an allotted or particular position or space. The movement of a vehicle at a speed greater than is imparted by the engine.
    overrunsSpread over or occupy (a place) in large numbers. Continue beyond or above an expected or allowed time or cost. An instance of something exceeding an expected or allowed time or cost. The movement or extension of something beyond an allotted or particular position or space. The movement of a vehicle at a speed greater than is imparted by the engine.
    oversExtending directly upward from. At a higher level or layer than. Higher than or more than (a specified number or quantity)Expressing passage or trajectory across. Expressing duration. By means of; by the medium of. On the subject of. No longer affected by. Expressing passage or trajectory across an area. Beyond and falling or hanging from a point. Used to express action and result. Used to express repetition of a process. (in two-way radio communication) used to indicate that the speaker has finished speaking and is awaiting a reply. Finished or complete. A sequence of six balls bowled by a bowler from one end of the pitch.
    overseasIn or to a foreign country, especially one across the sea. From, to, or relating to a foreign country, especially one across the sea.
    overseerA person who supervises others, especially workers.
    overshoeA shoe worn over a normal shoe, typically either of waterproof material to protect the normal shoe in wet weather or of fabric to protect a floor surface.
    oversizeBigger than the usual size.
    oversoulA divine spirit supposed to pervade the universe and to encompass all human souls. The term is associated particularly with Transcendentalism.
    overspinA rotating motion given to a ball when throwing or hitting it, used to give it extra speed or distance or to make it bounce awkwardly.
    overtimeTime in addition to what is normal, as time worked beyond one’s scheduled working hours. In addition to normal working hours.
    overtoneA musical tone which is a part of the harmonic series above a fundamental note, and may be heard with it. often overtones
    overtureAn orchestral piece at the beginning of an opera, suite, play, oratorio, or other extended composition. An introduction to something more substantial. usually overtures
    overturnTip (something) over so that it is on its side or upside down. Abolish, invalidate, or reverse (a previous system, decision, situation, etc. ) rare
    overuseUse (something) too much. Excessive use.
    overviewA general review or summary of a subject. Give a general review or summary of.
    overwordA repeated word or phrase, especially the burden or refrain of a song; a word or phrase frequently used by an individual.
    overworkCause (someone) to work beyond their capacity or strength. Make excessive use of. Excessive work.
    ovibosA genus of mammals of the family Bovidae whose only living representative is the musk ox, Ovibos moschatus; (also ovibos) a mammal of this genus, a musk ox (rare).
    oviductThe tube through which an ovum or egg passes from an ovary.
    ovisacA sac containing an ovum or a number of ova.
    ovisacsA sac containing an ovum or a number of ova.
    ovoid(of a solid or a three-dimensional surface) egg-shaped. An ovoid body or surface.
    ovoids(of a solid or a three-dimensional surface) egg-shaped. An ovoid body or surface.
    ovoloA rounded convex molding, in cross section a quarter of a circle or ellipse.
    ovuleA small or immature ovum.
    ovulesA small or immature ovum.
    ovumA mature female reproductive cell, especially of a human or other animal, which can divide to give rise to an embryo usually only after fertilization by a male cell.
    ovariotomiesovariotomistovariotomists
    ovariotomyovaritisovenwood
    overabundanceoverabundancesoveracting
    overactivityoverbalanceoverbalances
    overbearingnessoverburdenoverburdens
    overcapacityovercapitalisationovercapitalization
    overcastingoverchargeovercharges
    overchecksovercoatingovercompensation
    overcredulityoverdevelopmentoverdoses
    overdraftsoverdraughtoverdraughts
    overdressesovereatingoveremphasis
    overemphasisesoverenthusiasmoverestimate
    overestimatesoverestimationoverestimations
    overexcitabilityoverexertionoverexertions
    overexposureoverfallsoverfeeding
    overflightoverflightsoverflowing
    overflowingsoverflowsoverfolds
    overfondnessoverforwardnessoverfreedom
    overgarmentovergarmentsoverglazed
    overglazingovergrowthovergrowths
    overhangsoverhastinessoverhauling
    overhaulsoverheadsoverheating
    overheatsoverindulgenceoverindulgences
    overissueoverissuesoverkills
    overlappingoverloadsoverlooker
    overlookersoverlooksoverlords
    overlordshipovermantelovermantels
    overmastsovermatchovermatches
    overmatterovermattersovermeasure
    overmeasuresovermultiplicationovernighter
    overnightersoveroptimismoverpasses
    overpaymentoverpaymentsoverpluses
    overpopulationoverpraiseoverpraises
    overprintoverprintsoverproduction
    overrashnessoverratingoverreaction
    overreactionsoverreckoningoverrider
    overridersoverridesoverruler
    overrulersoverscrupulousnessoverseers
    overshirtovershirtsovershoes
    overshootovershootsoversight
    oversightsoversimplificationoversizes
    overskirtoverskirtsoverslaugh
    overslaughsoversleeveoversleeves
    oversoulsoverspecializationoverspill
    overspillsoverspinsoverstand
    overstandsoverstatementoverstatements
    overstockoverstockingoverstocks
    overstrainoverstrainsoverstudies
    overstudyoversubscriptionoversubtlety
    oversuppliesoversupplyovertaking
    overthrowoverthroweroverthrowers
    overthrowsoverthrustoverthrusts
    overtimesovertonesovertrick
    overtricksoverturesoverturning
    overturnsovervaluationovervaluations
    overviewsoverweightoverweights
    overwordsoverworkingoverworks
    oviparityovipositionovipositor
    ovipositorsovotestisovulation
    ovulations
    Nouns That Start With O

    17 Nouns Starting With OW

    OwenRobert 1771–1858 Welsh social reformerWilfred 1893–1918 British poet
    OwenismThe theory or system of social reform based on communistic cooperation advocated by Robert Owen.
    OwenistOwenite
    OweniteA supporter or advocate of Robert Owen or his proposed system of social reform. Of or relating to Robert Owen or his supporters, or in accordance with his theories of cooperation. A supporter of David Owen or his policies. Of or relating to David Owen, his policies, or his supporters.
    OwensJesse 1913–1980 James Cleveland Owens American track-and-field athleteriver in eastern California formerly flowing into and now supplying water to the city of Los Angeles by way of the Los Angeles Aqueduct
    oweltyEquality. In later use
    owlA nocturnal bird of prey with large forward-facing eyes surrounded by facial disks, a hooked beak, and typically a loud call.
    owletA small owl found chiefly in Asia and Africa.
    owletsA small owl found chiefly in Asia and Africa.
    owlishnessresembling or suggesting an owl
    owlsA nocturnal bird of prey with large forward-facing eyes surrounded by facial disks, a hooked beak, and typically a loud call.
    ownerA person who owns something.
    owner-driverA person who owns the vehicle they drive as a part of their job.
    owner-occupiera person who owns the dwelling he or she lives in
    ownersA person who owns something.
    ownershipThe act, state, or right of possessing something.
    ownershipsThe act, state, or right of possessing something.

    55 Words That Start With OX Nouns

    OxbridgeOxford and Cambridge universities regarded together.
    OxfordA city in central England, on the River Thames; population 146,100 (est. 2009). Oxford University is located here. A town in north central Mississippi, home to the University of Mississippi and associated with novelist William Faulkner; population 17,265 (est. 2008).
    Oxfordshirecounty of south central England; capital Oxfordarea 1044 square miles (2704 square kilometers), population654000
    OxonianRelating to Oxford, England, or Oxford University. A native or inhabitant of Oxford, England.
    Oxoniansa native or resident of Oxford, England
    Oxusriver over 1500 miles (2400 kilometers) long in central and western Asia flowing from the Pamirs into the Aral Sea
    oxalateA salt or ester of oxalic acid.
    oxalatesA salt or ester of oxalic acid.
    oxalisA plant of a genus which includes the wood sorrel, typically having three-lobed leaves and white, yellow, or pink flowers.
    oxalisesA plant of a genus which includes the wood sorrel, typically having three-lobed leaves and white, yellow, or pink flowers.
    oxazineAny of a class of compounds whose molecules contain a ring of one nitrogen, one oxygen, and four carbon atoms, some of which are used as dyes; specifically a monocyclic compound with this structure and the formula C₄ H₅ NO.
    oxazinesAny of a class of compounds whose molecules contain a ring of one nitrogen, one oxygen, and four carbon atoms, some of which are used as dyes; specifically a monocyclic compound with this structure and the formula C₄ H₅ NO.
    oxcarta cart drawn by oxen
    oxcartsa cart drawn by oxen
    oxenA castrated bull used as a draft animal.
    oxeyeA yellow-flowered North American plant of the daisy family.
    oxeyesany of several composite plants (as of the genera Chrysanthemum or Heliopsis) having heads with both disk and ray flowers
    oxgangA measure of land formerly in use in parts of northern England and Scotland, equivalent to an eighth of a carucate.
    oxgangsA measure of land formerly in use in parts of northern England and Scotland, equivalent to an eighth of a carucate.
    oxhideLeather made from the hide of an ox.
    oxidantAn oxidizing agent.
    oxidantsAn oxidizing agent.
    oxidaseAn enzyme which promotes the transfer of a hydrogen atom from a particular substrate to an oxygen molecule, forming water or hydrogen peroxide.
    oxidasesAn enzyme which promotes the transfer of a hydrogen atom from a particular substrate to an oxygen molecule, forming water or hydrogen peroxide.
    oxidationThe process or result of oxidizing or being oxidized.
    oxidationsthe act or process of oxidizing
    oxideA binary compound of oxygen with another element or group.
    oxidesA binary compound of oxygen with another element or group.
    oxidizationsoxidation
    oxidizeroxidizing agent
    oxidizersoxidizing agent
    oximeAny organic compound containing the group N(OH) attached to a carbon atom, formed by the reaction of hydroxylamine with an aldehyde or ketone. Compare aldoxime , “ketoxime”.
    oximesAny organic compound containing the group N(OH) attached to a carbon atom, formed by the reaction of hydroxylamine with an aldehyde or ketone. Compare aldoxime , “ketoxime”.
    oximeterAn instrument for measuring the proportion of oxygenated hemoglobin in the blood.
    oximetersAn instrument for measuring the proportion of oxygenated hemoglobin in the blood.
    oxlipA woodland Eurasian primula with yellow flowers that hang down one side of the stem.
    oxlipsA woodland Eurasian primula with yellow flowers that hang down one side of the stem.
    oxtailThe tail of a cow.
    oxtailsThe tail of a cow.
    oxterA person’s armpit.
    oxtersA person’s armpit.
    oxygenA colorless, odorless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air.
    oxygenateSupply, treat, charge, or enrich with oxygen.
    oxygenatesSupply, treat, charge, or enrich with oxygen.
    oxygenationto impregnate, combine, or supply (something, such as blood) with oxygen
    oxygenatorAn apparatus for oxygenating the blood.
    oxygenatorsAn apparatus for oxygenating the blood.
    oxyhaemoglobinhemoglobin loosely combined with oxygen that it releases to the tissues — compare deoxyhemoglobin
    oxymoronA figure of speech in which apparently contradictory terms appear in conjunction (e. g. faith unfaithful kept him falsely true)
    oxymoronsA figure of speech in which apparently contradictory terms appear in conjunction (e. g. faith unfaithful kept him falsely true)
    oxytocichastening childbirth
    oxytocinA hormone released by the pituitary gland that causes increased contraction of the uterus during labor and stimulates the ejection of milk into the ducts of the breasts.
    oxidisationoxidisations

    6 Nouns Beginning With OY

    oyera criminal trial held under a commission of oyer and terminer
    oyersa criminal trial held under a commission of oyer and terminer
    oyezA call given by a court officer, or formerly by public criers, typically repeated two or three times to command silence and attention, as before court is in session.
    oyezesa cry of oyez
    oysterAny of a number of bivalve mollusks with rough irregular shells. Several kinds are eaten (especially raw) as a delicacy and may be farmed for food or pearls. An oyster-shaped morsel of meat on each side of the backbone in poultry. Raise, dredge, or gather oysters.
    oystersAny of a number of bivalve mollusks with rough irregular shells. Several kinds are eaten (especially raw) as a delicacy and may be farmed for food or pearls. An oyster-shaped morsel of meat on each side of the backbone in poultry. Raise, dredge, or gather oysters.

    10 Nouns That Start With OZ

    OzalidA photocopy made by a process in which a diazonium salt and coupler are present in the paper coating, so that the image develops in the presence of ammonia.
    ozoceriteA brown or black paraffin wax occurring naturally in some shales and sandstones and formerly used in candles, polishes, and electrical insulation.
    ozokeriteA brown or black paraffin wax occurring naturally in some shales and sandstones and formerly used in candles, polishes, and electrical insulation.
    ozoneA colorless unstable toxic gas with a pungent odor and powerful oxidizing properties, formed from oxygen by electrical discharges or ultraviolet light. It differs from normal oxygen (O₂) in having three atoms in its molecule (O₃).
    ozonizerto treat, impregnate, or combine with ozone
    ozonizersto treat, impregnate, or combine with ozone
    ozonosphereozone layer
    OzzieOzziesOzzy

    Conclusion

    Read:  9350+ Nouns That Start With C

    This is just a small sampling of the many great nouns that start with the letter O. While it may be a difficult letter to find words for in some languages, English has no shortage of options. So the next time you’re stuck for a word, try looking to this list for some inspiration.

    Oasis, orbit, ocelot, octopus, odyssey, office, oil, onion, opera, and orange are only a few of the many nouns that start with O. With such a wide variety of options, you’re sure to find the perfect word for any situation.

    So don’t be afraid to experiment with different words starting with O. After all, the only way to improve your language skills is to try new things. Who knows, you may just find your new favorite word.

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