13-Letter Words Matching __O_________M

There are 13 13-letter words that match __O_________M. 3 are common words, such as NEOCLASSICISM and PROTECTIONISM. A rarer one is PROGRESSIVISM. In this set, I is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 13

neoclassicismprotectionismprovincialismapogeotropismisodimorphismneoliberalismneoplasticismprotoactiniumzoosporangiumcholangiogramodontoglossumphotochromismprogressivism

About this list

Words
13 (3 common words)
Common example
neoclassicism
Rare example
progressivism
Doubled letters
4
Ending in S
0
Most frequent letter
I (12)

Questions

How many 13-letter words matching __o_________m are there?

13. 3 of them are common words.

What is a common example?

NEOCLASSICISM is among the common words in this set.