4-Letter Words Matching _A_F

There are 17 4-letter words that match _A_F. 6 are common words, such as BARF and CALF. A rarer one is YAFF. In this set, F is the most frequent open letter (9 words). 10 words contain a doubled letter.

Full list 17

barfcalfgaffhalfnaifwaifcaffdafffaffhaafkaifnaffraffzarfbaffwaffyaff

About this list

Words
17 (6 common words)
Common example
barf
Rare example
yaff
Doubled letters
10
Ending in S
0
Most frequent letter
F (9)

Questions

How many 4-letter words matching _a_f are there?

17. 6 of them are common words.

What is a common example?

BARF is among the common words in this set.