13-Letter Words Matching ____M_____A__

There are 15 13-letter words that match ____M_____A__. 4 are common words, such as ANTIMACASSARS and ANTIMALARIALS. A rarer one is SPERMATOZOANS. In this set, T is the most frequent open letter (14 words). 3 words contain a doubled letter.

Full list 15

antimacassarsantimalarialsexcommunicateincommunicadochromatogramschromatographcinematographkinematographpneumatographredemonstratethermotherapythrombokinaseantimarijuanaplasmodesmataspermatozoans

About this list

Words
15 (4 common words)
Common example
antimacassars
Rare example
spermatozoans
Doubled letters
3
Ending in S
4
Most frequent letter
T (14)

Questions

How many 13-letter words matching ____m_____a__ are there?

15. 4 of them are common words.

What is a common example?

ANTIMACASSARS is among the common words in this set.