15-Letter Words Matching __A_O__________

There are 12 15-letter words that match __A_O__________. 3 are common words, such as ANALOGOUSNESSES and ELABORATENESSES. A rarer one is REASONABILITIES. In this set, N is the most frequent open letter (12 words). 6 words contain a doubled letter.

Full list 12

analogousnesseselaboratenessesseaworthinessescyanocobalaminsanacoluthicallyclamorousnessescyanocobalaminecyanoethylatingcyanoethylationdiagonalizationglamorousnessesreasonabilities

About this list

Words
12 (3 common words)
Common example
analogousnesses
Rare example
reasonabilities
Doubled letters
6
Ending in S
7
Most frequent letter
N (12)

Questions

How many 15-letter words matching __a_o__________ are there?

12. 3 of them are common words.

What is a common example?

ANALOGOUSNESSES is among the common words in this set.