12-Letter Words Matching ____O______M

There are 16 12-letter words that match ____O______M. 1 are common words, such as OVEROPTIMISM and ANDROCLINIUM. A rarer one is PICTORIALISM. In this set, I is the most frequent open letter (15 words). 2 words contain a doubled letter.

Full list 16

overoptimismandrocliniumchemotropismheliotropismhydrotropismmicroprogramnecrophilismperionychiumphilosophismphotorealismphototropismprocommunismradiothoriumanisotropismcladophyllumpictorialism

About this list

Words
16 (1 common words)
Common example
overoptimism
Rare example
pictorialism
Doubled letters
2
Ending in S
0
Most frequent letter
I (15)

Questions

How many 12-letter words matching ____o______m are there?

16. 1 of them are common words.

What is a common example?

OVEROPTIMISM is among the common words in this set.