15-Letter Words Matching __S__A_________

There are 16 15-letter words that match __S__A_________. 4 are common words, such as DESIRABLENESSES and DISGRACEFULNESS. A rarer one is POSTVACCINATION. In this set, I is the most frequent open letter (16 words). 5 words contain a doubled letter.

Full list 16

desirablenessesdisgracefulnessdishearteninglymiserablenessesabstractionismsabstractionistsdisheartenmentsmischaracterizemistranslationsdistractibilityinseparablenessmismeasurementsmistranscribingmusicalizationspostmastershipspostvaccination

About this list

Words
16 (4 common words)
Common example
desirablenesses
Rare example
postvaccination
Doubled letters
5
Ending in S
11
Most frequent letter
I (16)

Questions

How many 15-letter words matching __s__a_________ are there?

16. 4 of them are common words.

What is a common example?

DESIRABLENESSES is among the common words in this set.