15-Letter Words Matching ____C________L_

There are 15 15-letter words that match ____C________L_. 5 are common words, such as CONSCIENTIOUSLY and MASOCHISTICALLY. A rarer one is SEMICENTENNIALS. In this set, I is the most frequent open letter (14 words). 9 words contain a doubled letter.

Full list 15

conscientiouslymasochisticallyunexceptionableunexceptionablyunexceptionallycataclysmicallyergocalciferolsgynecologicallysynecdochicallytoxicologicallyautochthonouslyoverconfidentlypinocytoticallyquincentennialssemicentennials

About this list

Words
15 (5 common words)
Common example
conscientiously
Rare example
semicentennials
Doubled letters
9
Ending in S
3
Most frequent letter
I (14)

Questions

How many 15-letter words matching ____c________l_ are there?

15. 5 of them are common words.

What is a common example?

CONSCIENTIOUSLY is among the common words in this set.