12-Letter Words Matching S__________M

There are 22 12-letter words that match S__________M. 4 are common words, such as SECTARIANISM and SECTIONALISM. A rarer one is SYNDACTYLISM. In this set, I is the most frequent open letter (20 words). 4 words contain a doubled letter.

Full list 22

sectarianismsectionalismsomnambulismspiritualismscapegoatismsecessionismserpentiformsituationismspermogoniumstrychninismsubjectivismsuperpremiumsuperstardomsuperstratumsalvationismspermagoniumstandpattismsubmicrogramsuperrealismsycophantismsymmetallismsyndactylism

About this list

Words
22 (4 common words)
Common example
sectarianism
Rare example
syndactylism
Doubled letters
4
Ending in S
0
Most frequent letter
I (20)

Questions

How many 12-letter words matching s__________m are there?

22. 4 of them are common words.

What is a common example?

SECTARIANISM is among the common words in this set.