10-Letter Words Matching ___N_____M

There are 12 10-letter words that match ___N_____M. 5 are common words, such as DOWNSTREAM and EVANGELISM. A rarer one is STENOTHERM. In this set, R is the most frequent open letter (10 words). 1 words contain a doubled letter.

Full list 12

downstreamevangelismgymnospermiconoclasmmainstreamepineuriumfunnelformphanerogamprincipiumspongiformgrangerismstenotherm

About this list

Words
12 (5 common words)
Common example
downstream
Rare example
stenotherm
Doubled letters
1
Ending in S
0
Most frequent letter
R (10)

Questions

How many 10-letter words matching ___n_____m are there?

12. 5 of them are common words.

What is a common example?

DOWNSTREAM is among the common words in this set.