15-Letter Words Matching __A_________O__

There are 21 15-letter words that match __A_________O__. 9 are common words, such as BEAUTIFICATIONS and CHANNELIZATIONS. A rarer one is UNAPPRECIATIONS. 5 words contain a doubled letter.

Full list 21

beautificationschannelizationsclassificationsfraternizationsquantificationstransformationstransmigrationstransportationsweatherizationsamaryllidaceousscandalizationsblaxploitationsenantiomorphousevangelizationsgrandparenthoodgraphitizationsplasticizationstransaminationstransvaluationstraumatizationsunappreciations

About this list

Words
21 (9 common words)
Common example
beautifications
Rare example
unappreciations
Doubled letters
5
Ending in S
20

Questions

How many 15-letter words matching __a_________o__ are there?

21. 9 of them are common words.

What is a common example?

BEAUTIFICATIONS is among the common words in this set.