Countable Nouns That Start with OO

Find 33 valid English countable nouns starting with OO, including Ooh, Oops, Ooze, Oof, Oolong, Oop and Oodles. Check definitions and usage below, or visit our noun grammar guide to review singular and plural count rules.

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Starts with OO
1 words
oo
Starts with OOB
1 words
oobit
Starts with OOC
2 words
oocyte
oocyst
Starts with OOD
1 words
oodles
Starts with OOF
1 words
oof
Starts with OOG
2 words
oogonium
oogamete
Starts with OOH
1 words
ooh
Starts with OOJ
1 words
oojamaflip
Starts with OOL4 words
oolong
oolite
oologist
oolith
Starts with OOM4 words
oompah
oom
oom-pah-pah
oomycete
Starts with OON
1 words
oont
Starts with OOP8 words
oops
oop
oophorectomy
oophorosalpingectomy
oophyte
oophoron
oophorhysterectomy
oophorocystectomy
Starts with OOS3 words
oosphere
oospore
oosperm
Starts with OOT
2 words
ootheca
ootid
Starts with OOZ
1 words
ooze

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