15-Letter Words Matching ________A__O___

There are 31 15-letter words that match ________A__O___. 3 are common words, such as CONFRONTATIONAL and IMPROVISATIONAL. A rarer one is ULTRAMARATHONER. In this set, I is the most frequent open letter (30 words). 10 words contain a doubled letter.

Full list 31

Common words

confrontationalimprovisationalnonoccupationalcommunicationalconfigurationalelectronarcosishallucinationalinterrogationalpsychodiagnosisaccommodationalacculturationalallotetraploids
confrontationalimprovisationalnonoccupationalcommunicationalconfigurationalelectronarcosishallucinationalinterrogationalpsychodiagnosisaccommodationalacculturationalallotetraploidsallotetraploidyantieducationalautotetraploidsautotetraploidycarcinosarcomasdemonstrationaldocumentationalimmunodiagnosesimmunodiagnosisinterbehavioralinvestigationalmiscegenationalorchestrationalparticipationalpronunciationalrecombinationalretinoblastomastranspirationalultramarathoner

About this list

Words
31 (3 common words)
Common example
confrontational
Rare example
ultramarathoner
Doubled letters
10
Ending in S
8
Most frequent letter
I (30)

Questions

How many 15-letter words matching ________a__o___ are there?

31. 3 of them are common words.

What is a common example?

CONFRONTATIONAL is among the common words in this set.