13-Letter Words Matching _________A_O_

There are 21 13-letter words that match _________A_O_. 2 are common words, such as ADMINISTRATOR and DISCRIMINATOR. A rarer one is REINVIGORATOR. In this set, T is the most frequent open letter (20 words). 3 words contain a doubled letter.

Full list 21

administratordiscriminatorauthenticatorcongratulatordefibrillatordisintegratorindoctrinatormesencephalonmetencephalonmultivibratortelencephalontergiversatortransmigratorcoconspiratorconglomeratorinterpellatormonochromatornoncooperatorpredestinatorrehabilitatorreinvigorator

About this list

Words
21 (2 common words)
Common example
administrator
Rare example
reinvigorator
Doubled letters
3
Ending in S
0
Most frequent letter
T (20)

Questions

How many 13-letter words matching _________a_o_ are there?

21. 2 of them are common words.

What is a common example?

ADMINISTRATOR is among the common words in this set.