15-Letter Words Matching ___N_M_________

There are 14 15-letter words that match ___N_M_________. 3 are common words, such as INANIMATENESSES and TRANSMIGRATIONS. A rarer one is TRANSMISSOMETER. In this set, I is the most frequent open letter (13 words). 5 words contain a doubled letter.

Full list 14

inanimatenessestransmigrationstransmogrifyingeconometriciansethnomusicologytransmutabilityanonymousnesseseconometricallyphenomenalisticphenomenologiesphenomenologistplanimetricallysomnambulationstransmissometer

About this list

Words
14 (3 common words)
Common example
inanimatenesses
Rare example
transmissometer
Doubled letters
5
Ending in S
6
Most frequent letter
I (13)

Questions

How many 15-letter words matching ___n_m_________ are there?

14. 3 of them are common words.

What is a common example?

INANIMATENESSES is among the common words in this set.