9 letter nouns that start with O
We have listed 267 9-letter nouns that start with O for you in this WordMom word list. All these 9-letter nouns starting with O were verified by specialists in the English language.
- oarswoman
- obstinacy
- obliquity
- obedience
- obeisance
- obscenity
- obscurity
- objection
- obviation
- objective
- observant
- obsession
- obsessive
- obbligato
- obstruent
- obturator
- obtention
- obtrusion
- obeseness
- obtundent
- obreption
- obscurant
- obvention
- obversion
- obduction
- oblocutor
- oblongata
- objicient
- obeisancy
- objectist
- obtension
- occlusion
- occultism
- occultist
- occupancy
- occlusive
- occasions
- octameter
- occurrent
- octillion
- occipital
- occludent
- occulting
- octachord
- octostyle
- octateuch
- octochord
- ocypodian
- occursion
- odalisque
- odontalgy
- odorament
- oenophile
- oestrogen
- oenomania
- oenometer
- oenanthyl
- oenanthol
- offensive
- offertory
- officiant
- offspring
- oftenness
- offendant
- offension
- offerture
- oinomania
- olfactory
- oligarchy
- oligopoly
- olivenite
- olecranon
- oleoresin
- olfaction
- oligocene
- olivewood
- oleograph
- oliverian
- oleometer
- oleoptene
- olusatrum
- ombudsman
- omnirange
- omophagia
- omittance
- omnigraph
- omphalode
- omination
- onslaught
- onionskin
- onychosis
- oncometer
- onomancer
- onomatope
- onomatopy
- oncograph
- oneliness
- oneration
- oogenesis
- oostegite
- operation
- operative
- oppressor
- optometry
- operculum
- operagoer
- opercular
- operosity
- optometer
- opobalsam
- opodeldoc
- ophiology
- opusculum
- opponency
- oppugnant
- opsimathy
- ophiuchus
- opination
- opiniatre
- operatory
- opisthion
- ophidioid
- oppletion
- ophthalmy
- opalotype
- opiniator
- optocoele
- orphanage
- orchestra
- organizer
- orangeade
- orthodoxy
- ordinance
- organelle
- orangutan
- orography
- oriflamme
- organiser
- orthopter
- orrisroot
- ornithine
- orchotomy
- orthopedy
- orologist
- orthopnea
- orphanism
- orpharion
- organzine
- oratorian
- oricalche
- orangeman
- orthology
- orohippus
- origenism
- origenist
- orchester
- orchestre
- organogen
- orangeism
- orthodome
- orthogamy
- ordinator
- orichalch
- ostracism
- osteopath
- oscitancy
- osteology
- osteotomy
- osteocyte
- oscitance
- ossiculum
- osteogeny
- osmometer
- osmometry
- osteotome
- ostiarius
- ostleress
- ostracean
- ossifrage
- ostensory
- osculator
- ostrogoth
- osteolite
- osteomere
- ostracion
- ostracite
- ossuarium
- ostracoid
- ostension
- osmiamate
- osteocope
- otherness
- otologist
- otoplasty
- ottrelite
- otoconite
- otography
- outfitter
- outgrowth
- outrigger
- oubliette
- outskirts
- outerwear
- outlander
- outstroke
- outthrust
- outbidder
- outrunner
- oughtness
- ouroscopy
- outkeeper
- outstreet
- outsentry
- outground
- outparish
- ouanderoo
- ovulation
- overreach
- overwhelm
- overthrow
- overpower
- overstock
- overshoot
- overnight
- oversight
- overdraft
- overdrive
- overprint
- overcomer
- ovalbumin
- overskirt
- ovotestis
- overspill
- overlayer
- overhaste
- overissue
- ovoflavin
- overmatch
- overpoise
- overlight
- overtrust
- overruler
- oviparity
- overforce
- overmerit
- ovalbumen
- overstore
- overliver
- ovococcus
- ovoplasma
- ownership
- oxidation
- oxygenase
- oxacillin
- oxaprozin
- oxygenium
- oxalurate
- oxyphenol
- oxamidine
- oxanilate
- oxanilide
- oxalantin
- oxycymene
- oystering
- ozocerite
- ozokerite
- ozonation