15-Letter Words Matching __________N__M_

There are 12 15-letter words that match __________N__M_. 5 are common words, such as ANTIQUARIANISMS and EGALITARIANISMS. A rarer one is ULTRAMONTANISMS. 2 words contain a doubled letter.

Full list 12

antiquarianismsegalitarianismsobstructionismsservomechanismsutilitarianismsabstractionismsassociationismslibertarianismsmillenarianismschondrocraniumsrestrictionismsultramontanisms

About this list

Words
12 (5 common words)
Common example
antiquarianisms
Rare example
ultramontanisms
Doubled letters
2
Ending in S
12

Questions

How many 15-letter words matching __________n__m_ are there?

12. 5 of them are common words.

What is a common example?

ANTIQUARIANISMS is among the common words in this set.