4 Letter Countable Nouns Starting with O

This list gathers 62 English 4 letter countable nouns that start with O, such as Open, Okay, Oral, Oops, Oath, Odor and Ouch. 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 OA
2 words
oath
oast
Starts with OB5 words
oboe
obit
oban
obol
obex
Starts with OC
2 words
oche
occy
Starts with OD3 words
odor
odal
odax
Starts with OF
1 words
offy
Starts with OG3 words
ogre
ogle
ogee
Starts with OH
1 words
ohia
Starts with OI
1 words
oink
Starts with OK4 words
okay
okra
okie
okta
Starts with OL6 words
oleo
olio
olla
olea
olpe
olax
Starts with OM3 words
omen
omer
ombu
Starts with ON4 words
onus
onyx
oner
onos
Starts with OO3 words
oops
ooze
oont
Starts with OP5 words
open
opus
opal
oppo
opah
Starts with OR7 words
oral
orgy
orca
oryx
ordo
orle
orfe
Starts with OT
1 words
otto
Starts with OU3 words
ouch
ouzo
ouma
Starts with OV3 words
over
oval
ovum
Starts with OW
2 words
owie
ower
Starts with OX
1 words
oxer
Starts with OY
2 words
oyez
oyer

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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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