15-Letter Words Matching ____M________S_

There are 19 15-letter words that match ____M________S_. 2 are common words, such as ACRIMONIOUSNESS and CEREMONIOUSNESS. A rarer one is THERMOPERIODISM. In this set, I is the most frequent open letter (18 words). 13 words contain a doubled letter.

Full list 19

acrimoniousnessceremoniousnessassimilationistextemporarinessignominiousnessindomitablenessintemperatenessmetempsychosistthromboembolismantimaterialismantimaterialistassimilationismfragmentarinessgrammaticalnessillimitablenessopenmouthednessrudimentarinesssedimentologistthermoperiodism

About this list

Words
19 (2 common words)
Common example
acrimoniousness
Rare example
thermoperiodism
Doubled letters
13
Ending in S
11
Most frequent letter
I (18)

Questions

How many 15-letter words matching ____m________s_ are there?

19. 2 of them are common words.

What is a common example?

ACRIMONIOUSNESS is among the common words in this set.