12-Letter Words Matching ____M_____U_

There are 12 12-letter words that match ____M_____U_. 3 are common words, such as INCOMMODIOUS and PORTMANTEAUS. A rarer one is SPERMAGONIUM. In this set, O is the most frequent open letter (11 words). 2 words contain a doubled letter.

Full list 12

incommodiousportmanteausportmanteauxcinemathequemetamorphouspneumococcuspolymorphousspermogoniumunremorsefulascomycetousnonambiguousspermagonium

About this list

Words
12 (3 common words)
Common example
incommodious
Rare example
spermagonium
Doubled letters
2
Ending in S
7
Most frequent letter
O (11)

Questions

How many 12-letter words matching ____m_____u_ are there?

12. 3 of them are common words.

What is a common example?

INCOMMODIOUS is among the common words in this set.