5-Letter Words Matching _E_F_

There are 20 5-letter words that match _E_F_. 9 are common words, such as BEEFS and BEEFY. A rarer one is TEFFS. In this set, S is the most frequent open letter (13 words). 7 words contain a doubled letter.

Full list 20

beefsbeefydeifydelftleafsleafypelfsreefsserfsfeoffreifydelfskeefskerfsneifsreefyreifsseifsselfsteffs

About this list

Words
20 (9 common words)
Common example
beefs
Rare example
teffs
Doubled letters
7
Ending in S
13
Most frequent letter
S (13)

Questions

How many 5-letter words matching _e_f_ are there?

20. 9 of them are common words.

What is a common example?

BEEFS is among the common words in this set.