9-Letter Words Matching U____F___

There are 18 9-letter words that match U____F___. 6 are common words, such as UNDERFEED and UNDERFLOW. A rarer one is UPSHIFTED. In this set, N is the most frequent open letter (16 words). 8 words contain a doubled letter.

Full list 18

underfeedunderflowunderfootunderfursunruffledunselfishunderfundultrafastultrafineuncoffinsunconfuseuncuffingunmuffledunmufflesunperfectunroofingunshiftedupshifted

About this list

Words
18 (6 common words)
Common example
underfeed
Rare example
upshifted
Doubled letters
8
Ending in S
3
Most frequent letter
N (16)

Questions

How many 9-letter words matching u____f___ are there?

18. 6 of them are common words.

What is a common example?

UNDERFEED is among the common words in this set.