10-Letter Words Matching ____N____M

There are 21 10-letter words that match ____N____M. 6 are common words, such as BRAINSTORM and ECHINODERM. A rarer one is CORYNEFORM. In this set, I is the most frequent open letter (16 words). 2 words contain a doubled letter.

Full list 21

brainstormechinodermjournalismnonuniformspoonerismtechnetiumabsinthismactiniformchronogramcockneyismhypanthiumlaconicismlebensraummeitneriumnominalismoceanariumorganicismrevanchismsphenogramstrongroomcoryneform

About this list

Words
21 (6 common words)
Common example
brainstorm
Rare example
coryneform
Doubled letters
2
Ending in S
0
Most frequent letter
I (16)

Questions

How many 10-letter words matching ____n____m are there?

21. 6 of them are common words.

What is a common example?

BRAINSTORM is among the common words in this set.