4-Letter Words Matching _O_P

There are 16 4-letter words that match _O_P. 12 are common words, such as COMP and COOP. A rarer one is ROUP. In this set, O is the most frequent open letter (5 words). 5 words contain a doubled letter.

Full list 16

compcoopcoupgoopgorphooplooppomppooprompsoapsoupdorpholplouproup

About this list

Words
16 (12 common words)
Common example
comp
Rare example
roup
Doubled letters
5
Ending in S
0
Most frequent letter
O (5)

Questions

How many 4-letter words matching _o_p are there?

16. 12 of them are common words.

What is a common example?

COMP is among the common words in this set.