15-Letter Words Matching ____S____T_____

There are 12 15-letter words that match ____S____T_____. 3 are common words, such as PARASYMPATHETIC and PRAISEWORTHIEST. A rarer one is TRANSPOSITIONAL. In this set, I is the most frequent open letter (12 words). 2 words contain a doubled letter.

Full list 12

parasympatheticpraiseworthiesttransplantationnecessaritarianoversensitivitytranscriptionalhyposensitizinginvestigationalresystematizingsidesplittinglytranspirationaltranspositional

About this list

Words
12 (3 common words)
Common example
parasympathetic
Rare example
transpositional
Doubled letters
2
Ending in S
0
Most frequent letter
I (12)

Questions

How many 15-letter words matching ____s____t_____ are there?

12. 3 of them are common words.

What is a common example?

PARASYMPATHETIC is among the common words in this set.