15-Letter Words Matching ____E___C______

There are 12 15-letter words that match ____E___C______. 5 are common words, such as APPRENTICESHIPS and AUTHENTICATIONS. A rarer one is SYMMETRICALNESS. In this set, I is the most frequent open letter (11 words). 5 words contain a doubled letter.

Full list 12

apprenticeshipsauthenticationsdisrespectfullynondepreciatingperpendicularlycholecalciferoloxytetracyclineunspectacularlynonsensicalnessoverexpectationseptendecillionsymmetricalness

About this list

Words
12 (5 common words)
Common example
apprenticeships
Rare example
symmetricalness
Doubled letters
5
Ending in S
4
Most frequent letter
I (11)

Questions

How many 15-letter words matching ____e___c______ are there?

12. 5 of them are common words.

What is a common example?

APPRENTICESHIPS is among the common words in this set.