9-Letter Words Matching ___C____M

There are 21 9-letter words that match ___C____M. 6 are common words, such as CHECKROOM and CRUCIFORM. A rarer one is VULCANISM. In this set, I is the most frequent open letter (17 words). 5 words contain a doubled letter.

Full list 21

checkroomcruciformlunchroompracticumstockroomzirconiumbacciformcolchicumepicediumepicurismfalciformlanciformnarcotismpisciformsyncytiumvolcanismcalcaneumcoccidiumdisciformepicenismvulcanism

About this list

Words
21 (6 common words)
Common example
checkroom
Rare example
vulcanism
Doubled letters
5
Ending in S
0
Most frequent letter
I (17)

Questions

How many 9-letter words matching ___c____m are there?

21. 6 of them are common words.

What is a common example?

CHECKROOM is among the common words in this set.