12-Letter Words Matching A_________M_

There are 24 12-letter words that match A_________M_. 6 are common words, such as ABSENTEEISMS and AGNOSTICISMS. A rarer one is ASPERGILLUMS. 4 words contain a doubled letter.

Full list 24

absenteeismsagnosticismsagrarianismsanachronismsappendectomyastigmatismsacademicismsachromatismsadventurismsantheridiumsantirrhinumsarchiphonemeathleticismsautoerotismsadoptianismsadoptionismsadrenochromeantependiumsantielitismsantifascismsantirealismsarchdukedomsarteriogramsaspergillums

About this list

Words
24 (6 common words)
Common example
absenteeisms
Rare example
aspergillums
Doubled letters
4
Ending in S
21

Questions

How many 12-letter words matching a_________m_ are there?

24. 6 of them are common words.

What is a common example?

ABSENTEEISMS is among the common words in this set.