13-Letter Words Matching ___A________M

There are 13 13-letter words that match ___A________M. 1 are common words, such as PARALLELOGRAM and CATASTROPHISM. A rarer one is THEATRICALISM. In this set, I is the most frequent open letter (12 words). 5 words contain a doubled letter.

Full list 13

parallelogramcatastrophismimmaterialisminfallibilismoccasionalismparamagnetismvocationalismarmamentariumbipartisanismdecamethoniumhexamethoniumirrationalismtheatricalism

About this list

Words
13 (1 common words)
Common example
parallelogram
Rare example
theatricalism
Doubled letters
5
Ending in S
0
Most frequent letter
I (12)

Questions

How many 13-letter words matching ___a________m are there?

13. 1 of them are common words.

What is a common example?

PARALLELOGRAM is among the common words in this set.