13-Letter Words Matching ____A___O____

There are 52 13-letter words that match ____A___O____. 19 are common words, such as ACETAMINOPHEN and ARCHAEOLOGIES. A rarer one is THORACOTOMIES. In this set, I is the most frequent open letter (48 words). 5 words contain a doubled letter.

Full list 52

Common words

acetaminophenarchaeologiesarchaeologistcampanologiescampanologistclimatologiesclimatologistcompassionatedermatologiesdermatologistdispassionatehermaphrodite
acetaminophenarchaeologiesarchaeologistcampanologiescampanologistclimatologiesclimatologistcompassionatedermatologiesdermatologistdispassionatehermaphroditeintravenousesintravenouslymagnanimouslyonomatopoeiasonomatopoeticprecautionarysubcategoriesanfractuosityeschatologieseschatologistexplanatorilyneonatologistprimatologiestetrachloridethanatologistuntransformedvolcanologiesvolcanologistvulcanologiesvulcanologistantiauthoritycholangiogramcotransportedlollapaloozasmiscaptioningmiscatalogingnarratologiesnarratologistneonatologiesonomatologiesonomatologistprecautioningpreparatorilyprimatologistretransformedscalariformlysubcategorizetetrafluoridethanatologiesthoracotomies

About this list

Words
52 (19 common words)
Common example
acetaminophen
Rare example
thoracotomies
Doubled letters
5
Ending in S
17
Most frequent letter
I (48)

Questions

How many 13-letter words matching ____a___o____ are there?

52. 19 of them are common words.

What is a common example?

ACETAMINOPHEN is among the common words in this set.