12-Letter Words Matching _S________S_

There are 14 12-letter words that match _S________S_. 4 are common words, such as ISOLATIONISM and ISOLATIONIST. A rarer one is PSYCHOLOGISE. In this set, I is the most frequent open letter (14 words). 5 words contain a doubled letter.

Full list 14

isolationismisolationistpsychiatristpsychologistasynchronismescapologistessentialismessentialistpsephologistpsychologismusuriousnessassemblagistasterisklesspsychologise

About this list

Words
14 (4 common words)
Common example
isolationism
Rare example
psychologise
Doubled letters
5
Ending in S
2
Most frequent letter
I (14)

Questions

How many 12-letter words matching _s________s_ are there?

14. 4 of them are common words.

What is a common example?

ISOLATIONISM is among the common words in this set.