15-Letter Words Matching A_____I________

There are 13 15-letter words that match A_____I________. 6 are common words, such as ACCESSIBILITIES and ACQUISITIVENESS. A rarer one is ASTROBIOLOGISTS. In this set, T is the most frequent open letter (11 words). 8 words contain a doubled letter.

Full list 13

accessibilitiesacquisitivenessadmissibilitiesassertivenessesattentivenessesauthoritativelyasclepiadaceousacceptingnessesagglutinabilityamphidiploidiesanticlimacticalarrondissementsastrobiologists

About this list

Words
13 (6 common words)
Common example
accessibilities
Rare example
astrobiologists
Doubled letters
8
Ending in S
10
Most frequent letter
T (11)

Questions

How many 15-letter words matching a_____i________ are there?

13. 6 of them are common words.

What is a common example?

ACCESSIBILITIES is among the common words in this set.