Nouns that start with O

Are you looking for nouns that start with o (o nouns)? You can find over 1475 nouns starting with o from this wordmom list. All these nouns starting with o are validated using recognized English dictionaries.

Nouns can be considered as the most common class of word in the English language. Nouns have a wider definition but in simple words, a noun is a word that identifies a person, place thing or idea. Based on the use nouns can be categorized as common nouns, proper nouns, countable nouns, uncountable nouns etc. In this list of nouns that start with o, we have listed all those noun types in the alphabetical order.

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Nouns that start with oa

  • oad
  • oaf
  • oak
  • oaker
  • oakling
  • oakum
  • oaky
  • oar
  • oarfish
  • oarfoot
  • oarlock
  • oarsman
  • oarsweed
  • oasis
  • oast
  • oat
  • oatcake
  • oath
  • oathbreaking
  • oatmeal

Nouns that start with ob

  • obbe
  • obdiplostemony
  • obdormition
  • obduction
  • obduracy
  • obduration
  • obduredness
  • obdureness
  • obeah
  • obedience
  • obedienciary
  • obeisance
  • obeisancy
  • obelion
  • obelisk
  • obelus
  • oberon
  • oberration
  • obeseness
  • obesity
  • obeyer
  • obfirmation
  • obfuscation
  • obi
  • obit
  • obituary
  • object
  • objection
  • objectist
  • objectivation
  • objective
  • objectiveness
  • objectivity
  • objector
  • objicient
  • objuration
  • objurgation
  • oblateness
  • oblation
  • oblationer

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Nouns that start with oc

  • oca
  • occamy
  • occasion
  • occasionalism
  • occasionality
  • occasioner
  • occecation
  • occident
  • occipital
  • occiput
  • occision
  • occludent
  • occlusion
  • occult
  • occultation
  • occulting
  • occultism
  • occultist
  • occultness
  • occupancy
  • occupant
  • occupation
  • occupier
  • occurrence
  • occurrent
  • occurse
  • occursion
  • ocean
  • oceanography
  • oceanology
  • oceanus
  • ocellus
  • ocelot
  • ocher
  • ochimy
  • ochlesis
  • ochlocracy
  • ochre
  • ochrea
  • ochymy

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Nouns that start with od

  • od
  • odalisque
  • oddity
  • oddness
  • ode
  • odelet
  • odeon
  • odeum
  • odin
  • odist
  • odium
  • odmyl
  • odometer
  • odometry
  • odontalgia
  • odontalgic
  • odontalgy
  • odontiasis
  • odontoblast
  • odontogeny
  • odontograph
  • odontography
  • odontolite
  • odontology
  • odontophore
  • odontoplast
  • odontopteryx
  • odor
  • odorament
  • odorline
  • odyl
  • odyle
  • odyssey

Nouns that start with oe

  • oecoid
  • oecology
  • oeconomics
  • oeconomy
  • oedema
  • oeiliad
  • oeillade
  • oelet
  • oenanthate
  • oenanthol
  • oenanthone
  • oenanthyl
  • oenanthylate
  • oenanthylidene
  • oenocyan
  • oenology
  • oenomania
  • oenomel
  • oenometer
  • oenophilist
  • oes
  • oesophagus
  • oestrian
  • oestruation
  • oestrus

Nouns that start with of

  • off
  • offal
  • off-chance
  • offcut
  • offence
  • offendant
  • offender
  • offendress
  • offense
  • offension
  • offensive
  • offer
  • offerer
  • offering
  • offertory
  • offerture
  • office
  • officeholder
  • officer
  • official
  • officialily
  • officialism
  • officialty
  • officiant
  • officiator
  • offing
  • offlet
  • off-ramp
  • offscouring
  • offscum
  • offset
  • offshoot
  • offskip
  • oftenness

Nouns that start with og

  • ogam
  • ogdoad
  • ogdoastich
  • ogee
  • ogganition
  • ogham
  • ogive
  • ogle
  • ogler
  • oglio
  • ogre
  • ogreism
  • ogress
  • ogrism

Nouns that start with oh

  • ohm

Nouns that start with oi

  • oidium
  • oil
  • oilbird
  • oilcloth
  • oiler
  • oilery
  • oiliness
  • oillet
  • oilman
  • oilnut
  • oilseed
  • oilskin
  • oilstone
  • oinement
  • oinomania
  • ointment

Nouns that start with oj

  • ojo

Nouns that start with ok

  • ok
  • oke
  • okenite
  • oker
  • okra

Nouns that start with ol

  • old
  • oldish
  • oldness
  • oldster
  • olea
  • oleaginousness
  • oleamen
  • oleander
  • oleandrine
  • oleaster
  • oleate
  • olecranon
  • olefine
  • olein
  • oleograph
  • oleomargarine
  • oleometer
  • oleone
  • oleoptene
  • oleoresin
  • oleosity
  • olf
  • olfaction
  • olfactor
  • olfactory
  • oliban
  • olibanum
  • olibene
  • olifant
  • oligarch
  • oligarchist
  • oligarchy
  • oligocene
  • oligoclase
  • oligosiderite
  • olio
  • oliva
  • olive
  • olivenite
  • oliver

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Nouns that start with om

  • omagra
  • omasum
  • omber
  • ombre
  • ombrometer
  • omega
  • omelet
  • omen
  • omentum
  • omer
  • omination
  • omission
  • omittance
  • omitter
  • ommateum
  • ommatidium
  • omnibus
  • omniety
  • omniformity
  • omnigraph
  • omniparity
  • omnipercipience
  • omnipercipiency
  • omnipotence
  • omnipotency
  • omnipresence
  • omnipresency
  • omniscience
  • omnisciency
  • omnium
  • omnivore
  • omoplate
  • omostegite
  • omosternum
  • omphalocele
  • omphalode
  • omphalomancy
  • omphalopsychite
  • omphalopter
  • omphaloptic

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Nouns that start with on

  • onager
  • onagga
  • onanism
  • onappo
  • once-over
  • oncidium
  • oncograph
  • oncometer
  • oncotomy
  • onde
  • one
  • oneberry
  • oneirocriticism
  • oneirocritics
  • oneiromancy
  • oneiroscopist
  • oneiroscopy
  • one-liner
  • oneliness
  • onement
  • oneness
  • oneration
  • one-two
  • ongoing
  • onguent
  • onion
  • onliness
  • onloft
  • onocerin
  • onology
  • onomancy
  • onomasticon
  • onomatechny
  • onomatologist
  • onomatology
  • onomatope
  • onomatopoeia
  • onomatopy
  • onomomancy
  • on-ramp

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Nouns that start with oo

  • oo
  • ooecium
  • oogenesis
  • oogonium
  • ook
  • oolite
  • oologist
  • oology
  • oolong
  • oomiac
  • oomiak
  • oopack
  • oopak
  • oophore
  • oophorectomy
  • oophoridium
  • oophoritis
  • oophyte
  • oorial
  • oospere
  • oosperm
  • oosporangium
  • oospore
  • oostegite
  • ootheca
  • ootocoid
  • ootooid
  • ootype
  • ooze

Nouns that start with op

  • op
  • opacity
  • opah
  • opal
  • opalescence
  • opalotype
  • opaque
  • opaqueness
  • opeidoscope
  • opelet
  • open
  • openbill
  • opener
  • opening
  • openness
  • openwork
  • opera
  • operameter
  • operance
  • operancy
  • operand
  • operant
  • operation
  • operative
  • operator
  • operatory
  • opercle
  • opercular
  • operculum
  • operetta
  • operosity
  • opetide
  • ophicleide
  • ophidian
  • ophidioid
  • ophidion
  • ophiolatry
  • ophiologist
  • ophiology
  • ophiomancy

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Nouns that start with oq

  • oquassa

Nouns that start with or

  • or
  • ora
  • orabassu
  • orach
  • orache
  • oracle
  • oraison
  • oral
  • orang
  • orange
  • orangeade
  • orangeat
  • orangeism
  • orangeman
  • orangeroot
  • orangery
  • orangetawny
  • orangite
  • oration
  • orator
  • oratorian
  • oratorio
  • oratory
  • oratress
  • oratrix
  • orb
  • orbation
  • orbicle
  • orbicula
  • orbiculate
  • orbiculation
  • orbit
  • orbital
  • orbiter
  • orbitolites
  • orbitosphenoid
  • orbitude
  • orbity
  • orbulina
  • orc

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Nouns that start with os

  • os
  • osanne
  • oscan
  • oscillancy
  • oscillaria
  • oscillation
  • oscillator
  • oscinian
  • oscitancy
  • oscitation
  • osculation
  • osculatory
  • osculatrix
  • oscule
  • osculum
  • osier
  • osiery
  • osiris
  • osmanli
  • osmate
  • osmaterium
  • osmazome
  • osmiamate
  • osmidrosis
  • osmite
  • osmium
  • osmometer
  • osmometry
  • osmose
  • osmosis
  • osmund
  • osnaburg
  • osphradium
  • ospray
  • osprey
  • oss
  • osse
  • ossean
  • ossein
  • osselet

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Nouns that start with ot

  • otacoustic
  • otacousticon
  • otalgia
  • otalgic
  • otalgy
  • otary
  • otheoscope
  • otherness
  • othman
  • otiosity
  • otis
  • otitis
  • otoconite
  • otocrane
  • otocyst
  • otography
  • otolite
  • otolith
  • otologist
  • otology
  • otopathy
  • otoscope
  • otoscopy
  • otosteal
  • otozoum
  • ottar
  • otter
  • otto
  • ottoman
  • ottomite
  • ottrelite

Nouns that start with ou

  • ouakari
  • ouanderoo
  • ouarine
  • oubliette
  • ouch
  • ought
  • oughtness
  • ouistiti
  • oul
  • oulachan
  • ounce
  • ouphe
  • ourang
  • ouranographist
  • ouranography
  • ourebi
  • ourology
  • ouroscopy
  • ouse
  • ousel
  • oust
  • ouster
  • out
  • outbidder
  • outbreak
  • outbreaking
  • outbuilding
  • outburst
  • outcast
  • outcasting
  • outcome
  • outcourt
  • outcrier
  • outcrop
  • outcry
  • outdoors
  • outdweller
  • outer
  • outfall
  • outfield

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Nouns that start with ov

  • oval
  • ovalbumen
  • ovalbumin
  • ovariole
  • ovariotomist
  • ovariotomy
  • ovaritis
  • ovarium
  • ovary
  • ovation
  • oven
  • ovenbird
  • over
  • over-achiever
  • overaction
  • overall
  • overanxiety
  • overbalance
  • overburden
  • overcare
  • overchange
  • overcharge
  • overcoat
  • overcomer
  • overconfidence
  • overdeal
  • overdoer
  • overdose
  • overestimate
  • overexcitement
  • overexertion
  • overfall
  • overfatigue
  • overflow
  • overflowing
  • overflux
  • overforce
  • overfullness
  • overgreatness
  • overgrowth

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Nouns that start with ow

  • owch
  • owelty
  • owenite
  • owl
  • owlery
  • owlet
  • owlism
  • owllight
  • owner
  • ownership
  • owre
  • owse
  • owser

Nouns that start with ox

  • ox
  • oxacid
  • oxalan
  • oxalantin
  • oxalate
  • oxaldehyde
  • oxalethyline
  • oxaline
  • oxalis
  • oxalite
  • oxaluramide
  • oxalurate
  • oxalyl
  • oxamate
  • oxamethane
  • oxamethylane
  • oxamidine
  • oxanilate
  • oxanilide
  • oxanillamide
  • oxbane
  • oxbird
  • oxbiter
  • oxbow
  • oxeye
  • oxfly
  • oxford
  • oxgang
  • oxgoad
  • oxhead
  • oxheal
  • oxheart
  • oxhide
  • oxid
  • oxidability
  • oxidation
  • oxidator
  • oxide
  • oxidizement
  • oxidizer

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Nouns that start with oy

  • oyer
  • oylet
  • oynoun
  • oyster
  • oystering
  • oysterling

Nouns that start with oz

  • ozena
  • ozocerite
  • ozonation
  • ozone
  • ozonification
  • ozonization
  • ozonizer
  • ozonometer
  • ozonometry
  • ozonoscope