14-Letter Words Matching F________S____

There are 12 14-letter words that match F________S____. 3 are common words, such as FASTIDIOUSNESS and FLABBERGASTING. A rarer one is FUTURELESSNESS. 12 words contain a doubled letter.

Full list 12

fastidiousnessflabbergastingfortuitousnessfactitiousnessfallaciousnessfatherlessnessfelicitousnessfictitiousnessflagitiousnessfriendlessnessfathomlessnessfuturelessness

About this list

Words
12 (3 common words)
Common example
fastidiousness
Rare example
futurelessness
Doubled letters
12
Ending in S
11

Questions

How many 14-letter words matching f________s____ are there?

12. 3 of them are common words.

What is a common example?

FASTIDIOUSNESS is among the common words in this set.