13-Letter Words Matching ____S__A_____

There are 21 13-letter words that match ____S__A_____. 7 are common words, such as BOOTSTRAPPING and CHEESEPARINGS. A rarer one is WHIMSICALNESS. In this set, I is the most frequent open letter (18 words). 8 words contain a doubled letter.

Full list 21

bootstrappingcheeseparingsfenestrationsillustrationsministrationsregistrationstransplantingbackscratchercrassulaceousoverstrainingrensselaeritetransudationsglossolalistsgrossularitesmagistraticalmagistraturesmetasomatismsphrasemakingstransplanterstsutsugamushiwhimsicalness

About this list

Words
21 (7 common words)
Common example
bootstrapping
Rare example
whimsicalness
Doubled letters
8
Ending in S
14
Most frequent letter
I (18)

Questions

How many 13-letter words matching ____s__a_____ are there?

21. 7 of them are common words.

What is a common example?

BOOTSTRAPPING is among the common words in this set.