Nouns Starting with Letter O
Explore the list of 940 nouns starting with Letter o and see how they represent names of person, place, thing or concept.
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2 Letter Words
osox
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3 Letter Words
oafoakoaroatobiocaodeohmoilokaolaoldolmoneorboreoutowl
4 Letter Words
oastoathobitoboeoddsodorogeeogreoinkokayokehokeyokraoleoollaombuomenonusonyxoozeopahopalopenopusoralorcaoreoorgyoryxorzoouzoovalovenoverovumoxen
5 Letter Words
oakumoasisobeahoceanocherochreoctadoctetodistodiumodouroffalofferogiveogleroilerokapioldieoleinoligooliveologyomegaoniononsetoomphootidopepeoperaopiumopsinopticorachorangorbitorderorganorielorlopormer
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6 Letter Words
obecheobechiobiismobjectoblateoblongoboistobolusoccultocelotoctaneoctantoctaveoctavooctroiocularoculusoddityoedemaoeuvreofficeoffingoffsetogdoadogressohmageoilcanoilmanoilrigolefinomasumomeletomertaonageronrushonyxisoocyteoodlesoologyoolong
7 Letter Words
oarfishoarlockoarsmanoatcakeoatmealobelionobeliskobesityobligerobliqueobloquyobsequyobverseocarinaocciputocellusoctagonoctetteoctopodoctopusoculismoculistoddballoddmentoddnessodonateodysseyoenomeloerstedoestrusoffbeatoffenceoffenseoffererofferorofficeroffsideoilbirdoilfishoilseed
8 Letter Words
obduracyobituaryobjectoroblationobligatooblivionobserverobsidianobstacleoccasionoccidentoccupantoccupieroceanautocotillooctonaryoctoroonoddmentsodometeroenologyoestrioloestroneoffenderofferingofficialoffprintoffshootoffstageohmmeteroilclothoilfieldoilinessoilpaperoilstoneoilstoveointmentoldtimeroldwencholeanderoleaster
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9 Letter Words
oarswomanobbligatoobedienceobeisanceobjectionobjectiveobliquityobscenityobscurityobsessionobsessiveobstinacyobstruentobtentionobturatorobviationoccasionsocclusionocclusiveoccultismoccultistoccupancyoccurrentoctameteroctillionodalisqueoenophileoestrogenoffensiveoffertoryofficiantoffspringoftennessolecranonoleoresinolfactionoligarchyoligopolyoliveniteombudsman
10 Letter Words
oblatenessobligationoblongnessobservanceobstetricsobstinanceobstructerobstructorobtainmentobtusenessoccupationoccurrenceoceanfrontoceanologyochlocracyochronosisoctahedronoculomotorodiousnessodontalgiaodontiasisodontologyoecumenismoenologistoesophagusoestradiololigoclaseomeprazoleommatidiumoncologistonomasticsoophoritisopaquenessoperationsophiolatryophthalmiaoppositionoppressionopprobriumorangeness
11 Letter Words
oarsmanshipobfuscationobjectivityobjurgationobliquenessobliteratorobscurenessobservationobservatoryobsessivityobstipationobstructionobviousnessoccultationodynophagiaofficialdomofficialeseofficiatingofficiationoligochaeteoligodontiaomnipotenceomniscienceomphaloceleoneiromancyonerousnessonomasticonontogenesisonycholysisopalescenceoperosenessopportunismopportunistopportunityoptometristorchidalgiaorchiectomyorderlinessorientalismorientalist
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12 Letter Words
obligingnessobliterationobscurantismobscurantistobsolescenceobsoletenessobstetricianoceanographyoctogenarianoctosyllableoesophagitisofficeholderoligodactylyoligodendriaoligospermiaommastrephesomnipresenceoneiromanceronomatomaniaonomatopoeiaonychophoranoophorectomyophthalmitisopisthotonosoppositenessopsonisationopsonizationoptimisationoptimizationorchestratororchidectomyordinarinessorganisationorganizationornithomimidorphenadrineorthodonticsorthodontistorthodontureorthopaedics
13 Letter Words
objectivenessobliviousnessobnoxiousnessobsessivenessobtrusivenessoccidentalismoceanographerodontoglossumoffensivenessofficiousnessoleomargarineopacificationophthalmologyopportunenessorchestrationornamentalismornamentalistornamentationornithischianornithologistorthogonalityosteoblastomaosteomyelitisosteopetrosisoutdoorswomanoutspokennessoverabundanceoverappraisalovercredulityoverreckoningovershieldingoverstatementovertoleranceovervaluationoxyhemoglobinoystercatcher
14 Letter Words
obsequiousnessobstructionismobstructionistoesophagoscopeoleaginousnessoligomenorrheaomphaloskepsisonchocerciasisopenhandednessoperationalismophthalmectomyophthalmoscopeophthalmoscopyoppressivenessorganificationorthomyxovirusorthophosphateosteoarthritisosteochondromaosteodystrophyosteosclerosisotolaryngologyoutlandishnessoutrageousnessoverconfidenceoverestimationoverindulgenceoverpopulationoverproductionoverprotectionoverrefinementoxidoreductaseoxidoreductionoxyhaemoglobin
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15 Letter Words
objectificationoligodendrocyteoligodendrogliaoligonucleotideoligosaccharideophthalmologistophthalmoplegiaopisthorchiasisorganophosphateoverachievementoverbearingnessoverutilisationoverutilizationoxyphenbutazoneoxytetracycline
16 Letter Words
obstreperousnessostentatiousnessotherworldlinessotolaryngologistovercompensationoverexploitationoxyphencyclimine
17 Letter Words
objectionablenessoversensitiveness
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18 Letter Words
overcapitalisationovercapitalizationoversimplification
19 Letter Words
otorhinolaryngology
20 Letter Words
oophorosalpingectomy
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21 Letter Words
otorhinolaryngologist
Note: All nouns beginining with o are sorted based on length for easy browsing.
This list will help you brainstorm specific categories or discover more specific type of noun (e.g., common noun, proper noun, concrete noun, abstract noun) you might not have known before.