6 Letter Countable Nouns Starting with O

This list gathers 165 English 6 letter countable nouns that start with O, such as Office, Object, Option, Origin, Orange, Output and Oliver. 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 OB10 words
object
oblong
oblast
oblate
oboist
obeche
obiter
obeyer
obelus
obelia
Starts with OC11 words
octave
ocular
octane
ocelot
oculus
octavo
octant
ocicat
octroi
occamy
octuor
Starts with OD
2 words
oddity
odesan
Starts with OE
2 words
oeuvre
oecist
Starts with OF4 words
office
offset
offput
offcut
Starts with OG3 words
ogress
ogdoad
ogonek
Starts with OH
1 words
ohmage
Starts with OI10 words
oilman
oilcan
oilpan
oidium
oilway
oikist
oilery
oilcup
oilnut
oillet
Starts with OL8 words
oliver
olefin
oleate
olingo
olfact
olivet
ollamh
olluco
Starts with OM4 words
omelet
omnium
ombuds
omasum
Starts with ON15 words
onesie
onside
onrush
onager
onbeat
onglet
ontake
onycha
onflow
oncost
oneyer
onfall
oncome
onagra
onding
Starts with OO7 words
oolong
oodles
oocyte
oompah
oocyst
oolite
oolith
Starts with OP14 words
option
opioid
optics
opaque
opener
opiate
opcode
operon
optant
optime
ophrys
ophite
opifex
opulus
Starts with OR24 words
origin
orange
oracle
orphan
orgasm
orient
ordeal
orchid
orator
orisha
orison
orexin
orrery
oranda
orchis
orache
orbita
orchil
orogen
origan
orpine
orexis
orbity
orihau
Starts with OS13 words
oscars
osprey
ostomy
ostler
ostium
osetra
ostent
osmund
oscine
oscule
osmate
osmole
osiery
Starts with OT
1 words
ottava
Starts with OU17 words
output
outfit
outlet
outlaw
outage
outing
outset
outcry
ouster
outlay
outbox
ouncer
oubaas
oushak
outjet
ouklip
outler
Starts with OV3 words
ovibos
ovisac
ovator
Starts with OW
2 words
owlery
owelty
Starts with OX12 words
oxford
oxtail
oxcart
oxalis
oxslip
oxhead
oxherd
oxgang
oxymel
oxisol
oxland
oxgate
Starts with OY
1 words
oyster
Starts with OZ
1 words
ozalid

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