12-Letter Words Matching ___F__I_____

There are 12 12-letter words that match ___F__I_____. 3 are common words, such as PERFIDIOUSLY and PROFICIENTLY. A rarer one is TRIFOLIOLATE. In this set, I is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

perfidiouslyproficientlysufficientlyperfusionistunifoliolateairfreighteddiffusionismdiffusionistnonfeministssinfoniettassulfadiazinetrifoliolate

About this list

Words
12 (3 common words)
Common example
perfidiously
Rare example
trifoliolate
Doubled letters
4
Ending in S
2
Most frequent letter
I (12)

Questions

How many 12-letter words matching ___f__i_____ are there?

12. 3 of them are common words.

What is a common example?

PERFIDIOUSLY is among the common words in this set.