13-Letter Words Matching _S_________T_

There are 13 13-letter words that match _S_________T_. 5 are common words, such as ASTONISHMENTS and ESTRANGEMENTS. A rarer one is ESSENTIALISTS. In this set, S is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 13

astonishmentsestrangementsisolationistspsychiatristspsychologistsassignabilityassociativityescapologistsostensibilitypsephologistsassemblagistsastrocytomataessentialists

About this list

Words
13 (5 common words)
Common example
astonishments
Rare example
essentialists
Doubled letters
4
Ending in S
9
Most frequent letter
S (12)

Questions

How many 13-letter words matching _s_________t_ are there?

13. 5 of them are common words.

What is a common example?

ASTONISHMENTS is among the common words in this set.