15-Letter Words Matching S________T_____

There are 12 15-letter words that match S________T_____. 1 are common words, such as SUPPLEMENTATION and SALPINGECTOMIES. A rarer one is SYMPATHECTOMIES. In this set, E is the most frequent open letter (12 words). 4 words contain a doubled letter.

Full list 12

supplementationsalpingectomiesserendipitouslysacrosanctitiesschoolmasterishsesquicentenarysidesplittinglysilversmithingssubordinatenesssuperplasticitysuperspectaclessympathectomies

About this list

Words
12 (1 common words)
Common example
supplementation
Rare example
sympathectomies
Doubled letters
4
Ending in S
6
Most frequent letter
E (12)

Questions

How many 15-letter words matching s________t_____ are there?

12. 1 of them are common words.

What is a common example?

SUPPLEMENTATION is among the common words in this set.