13-Letter Words Matching _____C___O___

There are 23 13-letter words that match _____C___O___. 4 are common words, such as COEDUCATIONAL and NONRECIPROCAL. A rarer one is SPIROCHETOSES. In this set, I is the most frequent open letter (19 words). 3 words contain a doubled letter.

Full list 23

coeducationalnonreciprocalnonvocationalparticleboardconvocationalhydrocarbonicimplicationalphotocathodesphotocomposerspirochetosiscollocationalcorticotropincysticercoidscysticercosescysticercosisdisaccustomedhydrocolloidsmicrocosmosesphotocomposedphotocomposesplerocercoidsprevocationalspirochetoses

About this list

Words
23 (4 common words)
Common example
coeducational
Rare example
spirochetoses
Doubled letters
3
Ending in S
10
Most frequent letter
I (19)

Questions

How many 13-letter words matching _____c___o___ are there?

23. 4 of them are common words.

What is a common example?

COEDUCATIONAL is among the common words in this set.