12-Letter Words Matching ___M__N_____

There are 18 12-letter words that match ___M__N_____. 12 are common words, such as CHUMMINESSES and CLAMMINESSES. A rarer one is SWAMPINESSES. In this set, E is the most frequent open letter (18 words). 13 words contain a doubled letter.

Full list 18

chumminessesclamminessesclumsinessescommonnessescrumminessesflimsinessesgeomagnetismgrumpinessespromptnessesseemlinessesskimpinessessurmountablediamagnetismdismountabledismalnessesformalnesseskremlinologyswampinesses

About this list

Words
18 (12 common words)
Common example
chumminesses
Rare example
swampinesses
Doubled letters
13
Ending in S
13
Most frequent letter
E (18)

Questions

How many 12-letter words matching ___m__n_____ are there?

18. 12 of them are common words.

What is a common example?

CHUMMINESSES is among the common words in this set.