15-Letter Words Matching ___S____T______

There are 23 15-letter words that match ___S____T______. 10 are common words, such as CONSCIENTIOUSLY and CONSERVATIONISM. A rarer one is SUBSTITUTIONARY. In this set, I is the most frequent open letter (23 words). 6 words contain a doubled letter.

Full list 23

conscientiouslyconservationismconservationistconstitutionalsconstructionistnonsympathizerspessimisticallypreservationisttoastmistressestrustworthinessconservatorshipconstructivismsconstructivistshousemistressespresentationismpreservationismcrashworthinessdorsiventralitydorsoventralitynonsimultaneousphysiopathologypresynapticallysubstitutionary

About this list

Words
23 (10 common words)
Common example
conscientiously
Rare example
substitutionary
Doubled letters
6
Ending in S
9
Most frequent letter
I (23)

Questions

How many 15-letter words matching ___s____t______ are there?

23. 10 of them are common words.

What is a common example?

CONSCIENTIOUSLY is among the common words in this set.