11-Letter Words Matching __F__S_____

There are 12 11-letter words that match __F__S_____. 6 are common words, such as DEFENSELESS and DEFENSIVELY. A rarer one is REFRESHENED. 8 words contain a doubled letter.

Full list 12

defenselessdefensivelydiffusenessoffensivelyraffishnessrefreshmentdiffusionaldiffusivityoffenselessdefeasancesdiffusivelyrefreshened

About this list

Words
12 (6 common words)
Common example
defenseless
Rare example
refreshened
Doubled letters
8
Ending in S
5

Questions

How many 11-letter words matching __f__s_____ are there?

12. 6 of them are common words.

What is a common example?

DEFENSELESS is among the common words in this set.