8-Letter Words Matching U_____O_

There are 18 8-letter words that match U_____O_. 6 are common words, such as ULTERIOR and UNBUTTON. A rarer one is UTILIDOR. 4 words contain a doubled letter.

Full list 18

ulteriorunbuttonuncommonunderdogundertowunpersonunhallowunreasonunwisdomurushiolultrahotultralowunanchorundergodunforgotunicolorunmellowutilidor

About this list

Words
18 (6 common words)
Common example
ulterior
Rare example
utilidor
Doubled letters
4
Ending in S
0

Questions

How many 8-letter words matching u_____o_ are there?

18. 6 of them are common words.

What is a common example?

ULTERIOR is among the common words in this set.