15-Letter Words Matching __________A_O__

There are 23 15-letter words that match __________A_O__. 3 are common words, such as NONINFLAMMATORY and PROCRASTINATORS. A rarer one is TURBOGENERATORS. In this set, T is the most frequent open letter (22 words). 6 words contain a doubled letter.

Full list 23

noninflammatoryprocrastinatorsprognosticatorsanthropophagousdifferentiatorsexcommunicatorymyelencephalonsprocrastinatoryprognosticatorysclerodermatousbronchodilatorscoinvestigatorscollenchymatousdecontaminatorsdeuteranomalousechinodermatousepitheliomatousexcommunicatorsoxyphenbutazonepoststimulatorystratovolcanoestetragrammatonsturbogenerators

About this list

Words
23 (3 common words)
Common example
noninflammatory
Rare example
turbogenerators
Doubled letters
6
Ending in S
17
Most frequent letter
T (22)

Questions

How many 15-letter words matching __________a_o__ are there?

23. 3 of them are common words.

What is a common example?

NONINFLAMMATORY is among the common words in this set.