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Words starting with OO (7-letter)

A curated list of 7-letter words tailored to this exact pattern. When a clue points to OO starts, alternate vowel patterns and common blends after the prefix. For example: oocysts, oocytes, oodlins.

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19 words
Word Definition Length Syllables
oocysts72
oocytes73
oodlins72
oogonia73
oolites73
ooliths72
oolitic73
oologic73
oolongs72
oomiack72
oomiacs72
oomiaks72
oompahs72
oophyte72
ooralis73
oosperm72
oospore72
ootheca73
ooziest72

FAQs

Are OO-starting words common?
OO is a frequent start; probing vowel swaps after OO quickly narrows options.

Is this list good for crosswords?
Yes—filter by length mentally and scan definitions when available.