10-Letter Words Matching ____N___M_

There are 25 10-letter words that match ____N___M_. 7 are common words, such as CONUNDRUMS and GREENROOMS. A rarer one is TRIENNIUMS. In this set, S is the most frequent open letter (20 words). 3 words contain a doubled letter.

Full list 25

Common words

conundrumsgreenroomsmisinformspalindromereconfirmsspringtimestrontiumsathenaeumscairngormsdecenniumsgigantismshemangioma
conundrumsgreenroomsmisinformspalindromereconfirmsspringtimestrontiumsathenaeumscairngormsdecenniumsgigantismshemangiomamesenchymeunhandsomeaerenchymacheongsamschernozemsdoronicumsmelanosomemeningiomamisoneismsparenchymascientismstarantismstrienniums

About this list

Words
25 (7 common words)
Common example
conundrums
Rare example
trienniums
Doubled letters
3
Ending in S
16
Most frequent letter
S (20)

Questions

How many 10-letter words matching ____n___m_ are there?

25. 7 of them are common words.

What is a common example?

CONUNDRUMS is among the common words in this set.