9-Letter Words Matching ______O_A

There are 22 9-letter words that match ______O_A. 6 are common words, such as APPALOOSA and CARCINOMA. A rarer one is SUBMUCOSA. In this set, R is the most frequent open letter (16 words). 5 words contain a doubled letter.

Full list 22

appaloosacarcinomadiarrhoeahyperbolapyorrhoeasupernovaalgarrobacarambolacarnivoracherimoyachondromacondylomagranulomapapillomaponderosascagliolacataphorachirimoyahybridomamesogloeamycoflorasubmucosa

About this list

Words
22 (6 common words)
Common example
appaloosa
Rare example
submucosa
Doubled letters
5
Ending in S
0
Most frequent letter
R (16)

Questions

How many 9-letter words matching ______o_a are there?

22. 6 of them are common words.

What is a common example?

APPALOOSA is among the common words in this set.