14-Letter Words Matching ____S____T____

There are 39 14-letter words that match ____S____T____. 15 are common words, such as ASSASSINATIONS and DOMESTICATIONS. A rarer one is UNSYSTEMATIZED. In this set, I is the most frequent open letter (37 words). 7 words contain a doubled letter.

Full list 39

Common words

assassinationsdomesticationsexpostulationshairsplittingsindestructibleindestructiblyindispositionsindistinctnessinvestigationspraiseworthierresuscitationstranscriptions
assassinationsdomesticationsexpostulationshairsplittingsindestructibleindestructiblyindispositionsindistinctnessinvestigationspraiseworthierresuscitationstranscriptionstransmutationstranspirationstranspositionsindiscerptibleindiscreetnesspraiseworthilytranslocationsunsystematicalaccustomationsantiscientificchrestomathiesharuspicationshyposensitizedhyposensitizesmisassumptionsmisestimationsnecessitationsoversecretionsoverstructuredredescriptionsrediscountableredispositionsresystematizedresystematizestranscriptasestransplantableunsystematized

About this list

Words
39 (15 common words)
Common example
assassinations
Rare example
unsystematized
Doubled letters
7
Ending in S
26
Most frequent letter
I (37)

Questions

How many 14-letter words matching ____s____t____ are there?

39. 15 of them are common words.

What is a common example?

ASSASSINATIONS is among the common words in this set.