15-Letter Words Matching _O__C__________

There are 12 15-letter words that match _O__C__________. 5 are common words, such as CONSCIENTIOUSLY and CONSCIOUSNESSES. A rarer one is NONACHIEVEMENTS. In this set, I is the most frequent open letter (11 words). 7 words contain a doubled letter.

Full list 12

conscientiouslyconsciousnessesnonoccupationalpostconsonantalvoraciousnessesdolichocephalicpolycrystallinetoxicologicallycouncillorshipsmonochromatismsmonocrystallinenonachievements

About this list

Words
12 (5 common words)
Common example
conscientiously
Rare example
nonachievements
Doubled letters
7
Ending in S
5
Most frequent letter
I (11)

Questions

How many 15-letter words matching _o__c__________ are there?

12. 5 of them are common words.

What is a common example?

CONSCIENTIOUSLY is among the common words in this set.