7-Letter Words Matching A_____M

There are 20 7-letter words that match A_____M. 8 are common words, such as ACCLAIM and ACRONYM. A rarer one is AUSFORM. In this set, I is the most frequent open letter (10 words). 3 words contain a doubled letter.

Full list 20

acclaimacronymamalgamanagramanimismantonymatavismatheismableismaliformallonymalodiumalyssumapothemarcanumatomismaciformagendumantijamausform

About this list

Words
20 (8 common words)
Common example
acclaim
Rare example
ausform
Doubled letters
3
Ending in S
0
Most frequent letter
I (10)

Questions

How many 7-letter words matching a_____m are there?

20. 8 of them are common words.

What is a common example?

ACCLAIM is among the common words in this set.