12-Letter Words Matching ___N_____M__

There are 13 12-letter words that match ___N_____M__. 9 are common words, such as COUNCILWOMAN and COUNCILWOMEN. A rarer one is STENOTHERMAL. In this set, O is the most frequent open letter (11 words). 1 words contain a doubled letter.

Full list 13

councilwomancouncilwomencountrywomancountrywomenfrontiersmanfrontiersmenlaundrywomanlaundrywomenmainstreamedplanetesimalcountermemosphonogrammicstenothermal

About this list

Words
13 (9 common words)
Common example
councilwoman
Rare example
stenothermal
Doubled letters
1
Ending in S
1
Most frequent letter
O (11)

Questions

How many 12-letter words matching ___n_____m__ are there?

13. 9 of them are common words.

What is a common example?

COUNCILWOMAN is among the common words in this set.