13-Letter Words Matching __E_F________

There are 15 13-letter words that match __E_F________. 5 are common words, such as FRETFULNESSES and GLEEFULNESSES. A rarer one is OVERFULFILLED. 12 words contain a doubled letter.

Full list 15

fretfulnessesgleefulnessesineffectivelyineffectuallyinefficientlyunenforceableheedfulnessesinefficaciousdieffenbachiaineffablenessliebfraumilchneedfulnessesoverfertilizeoverfocussingoverfulfilled

About this list

Words
15 (5 common words)
Common example
fretfulnesses
Rare example
overfulfilled
Doubled letters
12
Ending in S
6

Questions

How many 13-letter words matching __e_f________ are there?

15. 5 of them are common words.

What is a common example?

FRETFULNESSES is among the common words in this set.