12-Letter Words Matching ____F_N_____

There are 14 12-letter words that match ____F_N_____. 7 are common words, such as FLUFFINESSES and INDEFENSIBLE. A rarer one is SPIFFINESSES. 4 words contain a doubled letter.

Full list 14

fluffinessesindefensibleindefensiblyindefinitelyredefinitionsemifinaliststuffinessesoverfancifulcodefendantsindefinablespathfindingssemifinishedsniffinessesspiffinesses

About this list

Words
14 (7 common words)
Common example
fluffinesses
Rare example
spiffinesses
Doubled letters
4
Ending in S
7

Questions

How many 12-letter words matching ____f_n_____ are there?

14. 7 of them are common words.

What is a common example?

FLUFFINESSES is among the common words in this set.