15-Letter Words Matching A_______O______

There are 22 15-letter words that match A_______O______. 3 are common words, such as ACRIMONIOUSNESS and ADVENTUROUSNESS. A rarer one is AUTORADIOGRAPHY. In this set, I is the most frequent open letter (19 words). 5 words contain a doubled letter.

Full list 22

acrimoniousnessadventurousnessambassadorshipsancylostomiasisankylostomiasisantinationalistautolithographyautoradiographsadenohypophysesadenohypophysisancylostomiasesanfractuositiesankylostomiasesantiaphrodisiacantiferromagnetantipornographyantirationalismantirationalistantirationalityatrabiliousnessautochthonouslyautoradiography

About this list

Words
22 (3 common words)
Common example
acrimoniousness
Rare example
autoradiography
Doubled letters
5
Ending in S
12
Most frequent letter
I (19)

Questions

How many 15-letter words matching a_______o______ are there?

22. 3 of them are common words.

What is a common example?

ACRIMONIOUSNESS is among the common words in this set.