13-Letter Words Matching F_N__________

There are 18 13-letter words that match F_N__________. 8 are common words, such as FANTASTICALLY and FENESTRATIONS. A rarer one is FUNGIBILITIES. In this set, I is the most frequent open letter (16 words). 6 words contain a doubled letter.

Full list 18

fantasticallyfenestrationsfinalizationsfingerprintedfinickinessesfunctionalityfunctionariesfundamentallyfingerbreadthfunctionalismfunctionalistfanaticalnessfantasticatedfantasticatesfencelessnessfingerpickingfinicalnessesfungibilities

About this list

Words
18 (8 common words)
Common example
fantastically
Rare example
fungibilities
Doubled letters
6
Ending in S
9
Most frequent letter
I (16)

Questions

How many 13-letter words matching f_n__________ are there?

18. 8 of them are common words.

What is a common example?

FANTASTICALLY is among the common words in this set.