13-Letter Words Matching A_________C__

There are 15 13-letter words that match A_________C__. 6 are common words, such as ACQUAINTANCES and ACQUIESCENCES. A rarer one is AUTECOLOGICAL. 2 words contain a doubled letter.

Full list 15

acquaintancesacquiescencesappurtenancesarcheologicalastronauticalastrophysicalaerodynamicalaphrodisiacalapocalypticalautographicalalchemisticalanticlassicalantipoliticalarborescencesautecological

About this list

Words
15 (6 common words)
Common example
acquaintances
Rare example
autecological
Doubled letters
2
Ending in S
4

Questions

How many 13-letter words matching a_________c__ are there?

15. 6 of them are common words.

What is a common example?

ACQUAINTANCES is among the common words in this set.