14-Letter Words Matching A_A___________

There are 18 14-letter words that match A_A___________. 5 are common words, such as ADAPTABILITIES and AMATEURISHNESS. A rarer one is AVASCULARITIES. In this set, I is the most frequent open letter (16 words). 7 words contain a doubled letter.

Full list 18

adaptabilitiesamateurishnessanaesthetizinganathematizingavailabilitiesamaranthaceousanacardiaceousanagrammaticalanagrammatizedanagrammatizesanamorphoscopeavariciousnessadaptationallyadaptivenessesanalphabetismsanaphrodisiacsarabicizationsavascularities

About this list

Words
18 (5 common words)
Common example
adaptabilities
Rare example
avascularities
Doubled letters
7
Ending in S
12
Most frequent letter
I (16)

Questions

How many 14-letter words matching a_a___________ are there?

18. 5 of them are common words.

What is a common example?

ADAPTABILITIES is among the common words in this set.