15-Letter Words Matching ____S________T_

There are 15 15-letter words that match ____S________T_. 2 are common words, such as HARPSICHORDISTS and VIVISECTIONISTS. A rarer one is UNANSWERABILITY. In this set, I is the most frequent open letter (15 words). 5 words contain a doubled letter.

Full list 15

harpsichordistsvivisectionistsindissolubilityirresistibilityoversensitivitytransferabilitytransilluminatetranslatabilitytransmutabilityunassailabilityantiseparatistsmonospecificitymonosyllabicityparasitologistsunanswerability

About this list

Words
15 (2 common words)
Common example
harpsichordists
Rare example
unanswerability
Doubled letters
5
Ending in S
4
Most frequent letter
I (15)

Questions

How many 15-letter words matching ____s________t_ are there?

15. 2 of them are common words.

What is a common example?

HARPSICHORDISTS is among the common words in this set.