9-Letter Words Matching _____UO__

There are 14 9-letter words that match _____UO__. 10 are common words, such as AMBIGUOUS and ASSIDUOUS. A rarer one is SONOBUOYS. In this set, S is the most frequent open letter (14 words). 3 words contain a doubled letter.

Full list 14

ambiguousassiduouscongruousdeciduousimpetuousingenuousinnocuouslifebuoysstrenuoussumptuousfructuousirriguousbeliquorssonobuoys

About this list

Words
14 (10 common words)
Common example
ambiguous
Rare example
sonobuoys
Doubled letters
3
Ending in S
14
Most frequent letter
S (14)

Questions

How many 9-letter words matching _____uo__ are there?

14. 10 of them are common words.

What is a common example?

AMBIGUOUS is among the common words in this set.