12-Letter Words Matching ___E_F______

There are 21 12-letter words that match ___E_F______. 6 are common words, such as CHEERFULLEST and CHEERFULNESS. A rarer one is WATERFOWLING. In this set, R is the most frequent open letter (19 words). 8 words contain a doubled letter.

Full list 21

cheerfullestcheerfulnessimperfectioninterferencenoneffectiveunderfeedingimperfectiveinterfertilepowerfulnessunderfundingunperforatedenfeoffmentsgreenfinchesinterfacingsinterfacultyinterfluvialinterfoldinginterfusionswaterfloodedwaterfowlerswaterfowling

About this list

Words
21 (6 common words)
Common example
cheerfullest
Rare example
waterfowling
Doubled letters
8
Ending in S
7
Most frequent letter
R (19)

Questions

How many 12-letter words matching ___e_f______ are there?

21. 6 of them are common words.

What is a common example?

CHEERFULLEST is among the common words in this set.