8-Letter Words Matching _____U_L

There are 21 8-letter words that match _____U_L. 10 are common words, such as BIANNUAL and BISEXUAL. A rarer one is REVENUAL. In this set, A is the most frequent open letter (15 words). 6 words contain a doubled letter.

Full list 21

biannualbisexualbrimfulleventualhabitualnumskulloverfullpunctualresidualtranquilfauteuilunsexualbellpullbimanualdecidualdividualexergualmonofuelmonohullnonequalrevenual

About this list

Words
21 (10 common words)
Common example
biannual
Rare example
revenual
Doubled letters
6
Ending in S
0
Most frequent letter
A (15)

Questions

How many 8-letter words matching _____u_l are there?

21. 10 of them are common words.

What is a common example?

BIANNUAL is among the common words in this set.