14-Letter Words Matching P___________M_

There are 18 14-letter words that match P___________M_. 5 are common words, such as PARALLELOGRAMS and PERFECTIONISMS. A rarer one is PROGRESSIVISMS. In this set, S is the most frequent open letter (17 words). 3 words contain a doubled letter.

Full list 18

parallelogramsperfectionismspostmodernismsprotectionismsprovincialismsparamagnetismsparticularismsprotoactiniumspaedomorphismspancreatectomypedestrianismsphenomenalismsphilhellenismsphotochromismsplethysmogramspococurantismspostmastectomyprogressivisms

About this list

Words
18 (5 common words)
Common example
parallelograms
Rare example
progressivisms
Doubled letters
3
Ending in S
16
Most frequent letter
S (17)

Questions

How many 14-letter words matching p___________m_ are there?

18. 5 of them are common words.

What is a common example?

PARALLELOGRAMS is among the common words in this set.