13-Letter Words Matching __R_________M

There are 13 13-letter words that match __R_________M. 3 are common words, such as CHRYSANTHEMUM and PARALLELOGRAM. A rarer one is IRRATIONALISM. In this set, I is the most frequent open letter (11 words). 3 words contain a doubled letter.

Full list 13

chrysanthemumparallelogramperfectionismceremonialismcorporativismferrochromiumparamagnetismparticularismperichondriumstructuralismvernacularismbureaucratismirrationalism

About this list

Words
13 (3 common words)
Common example
chrysanthemum
Rare example
irrationalism
Doubled letters
3
Ending in S
0
Most frequent letter
I (11)

Questions

How many 13-letter words matching __r_________m are there?

13. 3 of them are common words.

What is a common example?

CHRYSANTHEMUM is among the common words in this set.