15-Letter Words Matching A____T_________

There are 14 15-letter words that match A____T_________. 6 are common words, such as ACCEPTABILITIES and ADVENTUROUSNESS. A rarer one is ANISOTROPICALLY. In this set, I is the most frequent open letter (13 words). 10 words contain a doubled letter.

Full list 14

acceptabilitiesadventurousnessarchitecturallyaromatherapistsassertivenessesattentivenessesazidothymidinesacceptingnessesacculturationaladjustabilitiesaffectabilitiesagglutinabilityamphitheatricalanisotropically

About this list

Words
14 (6 common words)
Common example
acceptabilities
Rare example
anisotropically
Doubled letters
10
Ending in S
9
Most frequent letter
I (13)

Questions

How many 15-letter words matching a____t_________ are there?

14. 6 of them are common words.

What is a common example?

ACCEPTABILITIES is among the common words in this set.