13-Letter Words Matching ___E_F_______

There are 22 13-letter words that match ___E_F_______. 8 are common words, such as IMPERFECTIONS and IMPERFECTNESS. A rarer one is WATERFOWLINGS. In this set, I is the most frequent open letter (20 words). 5 words contain a doubled letter.

Full list 22

imperfectionsimperfectnessinterferencespaterfamiliassuperficiallysuperfluitiessuperfluouslyunselfishnesseigenfunctionimperfectivesmaterfamiliassuperfamiliessuperfetationhyperfunctioninterfamilialinterferogramnoneffectivessuperfluidityunderfinancedunperformablewaterfloodingwaterfowlings

About this list

Words
22 (8 common words)
Common example
imperfections
Rare example
waterfowlings
Doubled letters
5
Ending in S
11
Most frequent letter
I (20)

Questions

How many 13-letter words matching ___e_f_______ are there?

22. 8 of them are common words.

What is a common example?

IMPERFECTIONS is among the common words in this set.