14-Letter Words Matching _____N_M______

There are 12 14-letter words that match _____N_M______. 5 are common words, such as ALPHANUMERICAL and ASTRONOMICALLY. A rarer one is TREPONEMATOSIS. 6 words contain a doubled letter.

Full list 12

alphanumericalastronomicallypatronymicallytrigonometriesuneconomicallycarcinomatosismetronomicallyretransmissionretransmittingcarcinomatosestreponematosestreponematosis

About this list

Words
12 (5 common words)
Common example
alphanumerical
Rare example
treponematosis
Doubled letters
6
Ending in S
5

Questions

How many 14-letter words matching _____n_m______ are there?

12. 5 of them are common words.

What is a common example?

ALPHANUMERICAL is among the common words in this set.