12-Letter Words Matching ____M_____S_

There are 40 12-letter words that match ____M_____S_. 11 are common words, such as BICAMERALISM and ENORMOUSNESS. A rarer one is ULTIMATENESS. In this set, I is the most frequent open letter (34 words). 17 words contain a doubled letter.

Full list 40

Common words

bicameralismenormousnessentomologistheadmistressmetamorphismmetamorphosepostmistressseismologisttaskmistressuncommonnessuntimelinessaccompanyist
bicameralismenormousnessentomologistheadmistressmetamorphismmetamorphosepostmistressseismologisttaskmistressuncommonnessuntimelinessaccompanyistallomorphismautomorphismchromaticismdisembarrassendomorphismhomomorphismhylomorphisminfamousnessmonometalismparamorphismpleomorphismpolymorphismpragmaticismtriumphalismtriumphalistvenomousnessassemblagistautomobilistbasementlessdreamfulnessenzymologisthemimorphismintimatenessmonomorphismpragmaticistqualmishnesssnowmobilistultimateness

About this list

Words
40 (11 common words)
Common example
bicameralism
Rare example
ultimateness
Doubled letters
17
Ending in S
14
Most frequent letter
I (34)

Questions

How many 12-letter words matching ____m_____s_ are there?

40. 11 of them are common words.

What is a common example?

BICAMERALISM is among the common words in this set.