13-Letter Words Matching __N____M_____

There are 18 13-letter words that match __N____M_____. 3 are common words, such as CONCERTMASTER and NONAUTOMOTIVE. A rarer one is TENDEROMETERS. In this set, O is the most frequent open letter (17 words). 2 words contain a doubled letter.

Full list 18

concertmasternonautomotivenonjudgmentaldensitometerslonganimitiesmonogrammaticmonosymmetricnonparametricpenultimatelysensitometerssynchromeshescondylomatousdensitometricnonincumbentsnonleguminouspenetrometerssensitometrictenderometers

About this list

Words
18 (3 common words)
Common example
concertmaster
Rare example
tenderometers
Doubled letters
2
Ending in S
9
Most frequent letter
O (17)

Questions

How many 13-letter words matching __n____m_____ are there?

18. 3 of them are common words.

What is a common example?

CONCERTMASTER is among the common words in this set.