12-Letter Words Matching _________AC_

There are 18 12-letter words that match _________AC_. 4 are common words, such as APHRODISIACS and DIPSOMANIACS. A rarer one is ULTRACOMPACT. In this set, I is the most frequent open letter (13 words). 1 words contain a doubled letter.

Full list 18

aphrodisiacsdipsomaniacshemophiliacsillegitimacyfluidextractgerontocracyinarticulacyintermediacypantisocracyundersurfacealgolagniacsantikickbackhypersurfacemythomaniacsnoncandidacyoverabstractsemiabstractultracompact

About this list

Words
18 (4 common words)
Common example
aphrodisiacs
Rare example
ultracompact
Doubled letters
1
Ending in S
5
Most frequent letter
I (13)

Questions

How many 12-letter words matching _________ac_ are there?

18. 4 of them are common words.

What is a common example?

APHRODISIACS is among the common words in this set.