13-Letter Words Matching ____A_____A__

There are 20 13-letter words that match ____A_____A__. 7 are common words, such as BACCALAUREATE and COMPANIONWAYS. A rarer one is ULTRARADICALS. In this set, T is the most frequent open letter (18 words). 5 words contain a doubled letter.

Full list 20

baccalaureatecompanionwayscompassionatedispassionateextraordinarypediatriciansprecautionarygeriatriciansextraliteraryintransigeantneuraminidaseonomasticiansoutmanipulateprocathedralsthalassocracythalassocratsultrafiltrateultraliberalsultramilitantultraradicals

About this list

Words
20 (7 common words)
Common example
baccalaureate
Rare example
ultraradicals
Doubled letters
5
Ending in S
8
Most frequent letter
T (18)

Questions

How many 13-letter words matching ____a_____a__ are there?

20. 7 of them are common words.

What is a common example?

BACCALAUREATE is among the common words in this set.