12-Letter Words Matching ____A____R__

There are 14 12-letter words that match ____A____R__. 3 are common words, such as ALPHANUMERIC and COMMANDEERED. A rarer one is THALASSOCRAT. 5 words contain a doubled letter.

Full list 14

alphanumericcommandeeredmortarboardscabbagewormsostracodermsprocathedralsupranaturalultraliberalvernacularlybuffaloberrycotransportspassageworksretransformsthalassocrat

About this list

Words
14 (3 common words)
Common example
alphanumeric
Rare example
thalassocrat
Doubled letters
5
Ending in S
6

Questions

How many 12-letter words matching ____a____r__ are there?

14. 3 of them are common words.

What is a common example?

ALPHANUMERIC is among the common words in this set.