12-Letter Words Matching __F_N_______

There are 16 12-letter words that match __F_N_______. 3 are common words, such as DEFINITENESS and DEFINITIVELY. A rarer one is INFUNDIBULAR. In this set, I is the most frequent open letter (15 words). 2 words contain a doubled letter.

Full list 16

definitenessdefinitivelyinfanticidesdefenestratedefinitionalinfantilismsinfinitenessinfundibulumbifunctionaldefinitizingdifunctionalinfanticidalinfantilizedinfantilizesinfinitivelyinfundibular

About this list

Words
16 (3 common words)
Common example
definiteness
Rare example
infundibular
Doubled letters
2
Ending in S
5
Most frequent letter
I (15)

Questions

How many 12-letter words matching __f_n_______ are there?

16. 3 of them are common words.

What is a common example?

DEFINITENESS is among the common words in this set.