10 Letter Countable Nouns Starting with O
Browse 194 valid English 10 letter countable nouns that start with O, from Opposition, Occupation, Obligation, Occurrence, Oppression, Observable and Onboarding to rarer terms. Check definitions and spelling below, or visit our noun grammar guide to review singular and plural count rules.
Refine list...
Starts with OB20 words
obligation
observable
observance
obtainment
obituarist
obstructor
oblateness
obturation
observator
objurgator
obsoletion
obligative
observancy
obduration
obsoletism
obeliskoid
obeliscoid
obligement
objuration
obvolution
Starts with OC18 words
occupation
occurrence
oceanfront
occidental
octahedron
oculomotor
octocopter
ochlocracy
octothorpe
oceanarium
octodecimo
occasioner
octogenary
ocellation
octonarius
octopusher
octandrian
octonarian
Starts with OD5 words
odontocete
odontalgia
odontolite
odontalgic
odorophore
Starts with OE
1 words oenologist
Starts with OF5 words
officemate
offspinner
officiator
offendress
officialty
Starts with OL4 words
oligopsony
oleography
oligoclase
oleothorax
Starts with OM10 words
omnipotent
omniscient
omeprazole
omnisexual
ommatidium
ombrophile
ombrometer
omophorion
omphalodes
ombrophobe
Starts with ON4 words
onboarding
oncologist
ontologist
onocentaur
Starts with OO
1 words oojamaflip
Starts with OP16 words
opposition
oppression
opinionist
oppugnancy
operettist
ophicleide
ophiopogon
opisometer
oppilation
oppilative
ophiolater
opsiometer
ophiomorph
optologist
opsomaniac
optomeninx
Starts with OR24 words
ornamental
ordination
originator
oropharynx
ordainment
ordonnance
orchardist
organigram
orthorexic
orogenesis
ornithopod
orientator
orthoclase
organogram
orthopraxy
organicist
orotundity
orthoptist
oropendola
orthograph
orthoepist
orangequat
orthoscope
orchardman
Starts with OS18 words
oscillator
osteopathy
osmolarity
osmolality
osteoblast
osteoclast
osculation
osteophyte
osmophobia
ostracizer
osculatory
osmiridium
oscitation
ostracodan
osmophobic
osmeterium
osculatrix
ostrowskia
Starts with OT4 words
otherworld
otocinclus
otterhound
otosalpinx
Starts with OU15 words
outpatient
outpouring
outfielder
outstretch
outsourcer
outworking
outstation
outswinger
outworlder
outgassing
outmigrant
ouananiche
outwelling
outlodging
ouvirandra
Starts with OV24 words
overriding
overcharge
overground
overgrowth
oversupply
overburden
overflight
oversharer
overdesign
overstress
overbridge
overdosage
overlander
overthrust
overstayer
overstrain
overlength
overaction
ovipositor
overlooker
overstitch
overmantel
overblouse
overturner
Starts with OX5 words
oxygenator
oxycephaly
oxypetalum
oxysulfide
oxygenizer
Starts with OZ
2 words ozonolysis
ozothamnus