Countable Nouns Starting with O and Containing S
This list gathers 652 English countable nouns starting with O and containing S, such as Occasion, Opposition, Offense, Observation, Ownership, Offensive and Obstacle. Use the sorting controls below to organize entries by length, or consult our noun grammar guide to review singular and plural count rules.
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Starts with OA7 words
oasis
oarsman
oast
oarfish
oarswoman
oasthouse
oanshagh
Starts with OB24 words
observation
obstacle
observer
obsession
obstruction
obsessive
obscurity
observable
observance
observatory
obscenity
obsidian
obfuscation
obstetrician
obstinacy
obelisk
observability
obeisance
obstructionist
oblast
obverse
obsequies
obscuration
objectivist
Starts with OC24 words
occasion
octopus
oceanside
occlusion
occultist
oculus
oculist
occlusive
occidentalism
occasionalism
occidentalist
ocellus
ocularist
octosyllabic
oceanologist
occasionalist
occipitofrontalis
occasionality
octosyllable
occipitoposterior
occlusor
occasioner
octastyle
octostyle
Starts with OD14 words
odyssey
oddness
oddsmaker
odalisque
odist
odontoblast
odontologist
odesan
odontist
oddsman
odontornithes
odonatologist
odontoglossum
odonatist
Starts with OE4 words
oersted
oenologist
oenophilist
oecist
Starts with OF13 words
offense
offensive
offset
offspring
offseason
offside
offshoot
offspinner
offsider
offhandedness
offcast
offscouring
offendress
Starts with OG3 words
ogress
ogrefish
oghamist
Starts with OI5 words
oilseed
oilskin
oilstone
oilfish
oikist
Starts with OL14 words
olympics
oldster
oligosaccharide
ologist
oloroso
oligopolist
oligopsony
oleoresin
oldsquaw
oleaster
oligoclase
olfactologist
oligist
olecranarthritis
Starts with OM14 words
omission
ombudsman
omnibus
omniscient
ombudsperson
omakase
ombuds
omnisexual
omnishambles
omphalos
omasum
omusubi
omphalodes
omentosplenopexy
Starts with ON24 words
onset
onslaught
onus
oncologist
onesie
onside
onrush
oncovirus
ontologist
onionskin
onanist
onomatopoiesis
oncomouse
oncost
onomasticon
onsetter
onychocryptosis
oncornavirus
onomatologist
onomastician
onos
oneirocritics
onychitis
onomast
Starts with OO10 words
oops
oodles
oocyst
oologist
oosphere
oospore
oophorosalpingectomy
oosperm
oophorhysterectomy
oophorocystectomy
Starts with OP24 words
opposite
opposition
oppression
optics
optimist
oppressor
opus
opportunist
opossum
optometrist
ophthalmologist
opposer
opsin
opencast
ophthalmoscope
oppositionist
openside
operatorship
opsonization
ophthalmoscopy
operationalist
optimates
ophrys
opinionist
Starts with OQ
1 words oquassa
Starts with OR24 words
organism
orchestra
orgasm
orchestration
orthodontist
organist
orthotics
orchestrator
orientalism
ornithologist
originalist
orientalist
orthopedist
orisha
orison
organophosphate
organogenesis
orris
organophosphorus
orbicularis
orthotist
orchardgrass
orchardist
orchis
Starts with OS24 words
oscars
ostrich
osmosis
oscillation
oscillator
osprey
ostracism
os
ostentation
ostomy
oscilloscope
osteopathy
osteopath
ossification
ostler
osmolarity
osteosarcoma
osteoid
osteria
ostia
ossuary
osteonecrosis
osteocyte
osteomyelitis
Starts with OT10 words
otoscope
otorhinolaryngologist
otoplasty
otologist
otoscopy
otocinclus
otosclerotic
otiosity
otocyst
otosalpinx
Starts with OU24 words
outside
outsider
outskirts
outset
outcast
outpost
outburst
ouster
outhouse
outgoings
outstretch
outdoorsman
outsize
outskirt
outsourcer
outspread
ouroboros
outshot
outshoot
outsole
outdoorswoman
outstation
outswinger
outcaste
Starts with OV24 words
oversight
overdose
overalls
overseer
overcast
overpass
overshoot
overestimate
oversize
overstatement
overstay
overstock
overspend
overshare
oversell
oversimplification
overexposure
overemphasis
oversupply
overrepresentation
overcompensation
overestimation
overshot
overdress
Starts with OW
2 words ownership
owens
Starts with OX9 words
oxidase
oxalis
oxygenase
oxslip
oxidoreductase
oxisol
oxysalt
oxysome
oxysulfide
Starts with OY4 words
oyster
oystercatcher
oysterman
oysterer
Starts with OZ3 words
ozonolysis
ozonosphere
ozothamnus