12-Letter Words Matching ____T_____M_

There are 18 12-letter words that match ____T_____M_. 4 are common words, such as BIMETALLISMS and CREATIONISMS. A rarer one is SCATTERGRAMS. In this set, S is the most frequent open letter (16 words). 3 words contain a doubled letter.

Full list 18

bimetallismscreationismseinsteiniumspointillismsclostridiumscounterstampcytotaxonomyendotheliomaspectrogramsadoptianismsadoptionismscryptarithmselectroformselectrogramsmesotheliomapositroniumsproctodaeumsscattergrams

About this list

Words
18 (4 common words)
Common example
bimetallisms
Rare example
scattergrams
Doubled letters
3
Ending in S
14
Most frequent letter
S (16)

Questions

How many 12-letter words matching ____t_____m_ are there?

18. 4 of them are common words.

What is a common example?

BIMETALLISMS is among the common words in this set.