13-Letter Words Matching ___A_____O___

There are 19 13-letter words that match ___A_____O___. 6 are common words, such as BREASTSTROKES and CLEARINGHOUSE. A rarer one is PARATHORMONES. 3 words contain a doubled letter.

Full list 19

breaststrokesclearinghousemetamorphosedmetamorphosesmetamorphosisstrangleholdsgynandromorphincantationalmetafictionalrepartitionedspeakerphonesbreaststrokercreaturehoodsdisaccustomedfurazolidonesmetallophonesnonantibioticparasitologicparathormones

About this list

Words
19 (6 common words)
Common example
breaststrokes
Rare example
parathormones
Doubled letters
3
Ending in S
9

Questions

How many 13-letter words matching ___a_____o___ are there?

19. 6 of them are common words.

What is a common example?

BREASTSTROKES is among the common words in this set.