Nouns That Start with OO

Find 44 valid English nouns starting with OO, including Ooh, Oops, Ooze, Oof, Oomph, Oolong and Oop. Check definitions and usage below, or visit our noun grammar guide to review pluralization and capitalization rules.

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Starts with OO
1 words
oo
Starts with OOB2 words
oobleck
oobit
Starts with OOC2 words
oocyte
oocyst
Starts with OOD1 words
oodles
Starts with OOF3 words
oof
ooftish
oofiness
Starts with OOG5 words
oogenesis
oogonium
oogamy
oogeny
oogamete
Starts with OOH1 words
ooh
Starts with OOJ1 words
oojamaflip
Starts with OOL5 words
oolong
oology
oolite
oologist
oolith
Starts with OOM5 words
oomph
oompah
oom
oom-pah-pah
oomycete
Starts with OON1 words
oont
Starts with OOP9 words
oops
oop
oophorectomy
oophoritis
oophorosalpingectomy
oophyte
oophoron
oophorhysterectomy
oophorocystectomy
Starts with OOS4 words
oosphere
oospore
oose
oosperm
Starts with OOT2 words
ootheca
ootid
Starts with OOZ2 words
ooze
ooziness

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ABCDEFGHIJKLMNOPQRSTUVWXYZ
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