15-Letter Words Matching ____AC_________

There are 18 15-letter words that match ____AC_________. 3 are common words, such as CHARACTERISTICS and EXTRACURRICULAR. A rarer one is ULTRACONVENIENT. In this set, E is the most frequent open letter (18 words). 10 words contain a doubled letter.

Full list 18

characteristicsextracurricularimplacabilitiesimpracticalnessintractablenessoverachievementsarraceniaceousultracentrifugeanfractuositiesextracellularlyintracellularlyintracerebrallyoveraccentuatedoveraccentuatespolyacrylamidesrefractometriesultracommercialultraconvenient

About this list

Words
18 (3 common words)
Common example
characteristics
Rare example
ultraconvenient
Doubled letters
10
Ending in S
9
Most frequent letter
E (18)

Questions

How many 15-letter words matching ____ac_________ are there?

18. 3 of them are common words.

What is a common example?

CHARACTERISTICS is among the common words in this set.