C and E:

People who only show up at church on Christmas and Easter, the only two times a year where church attendance seems 'mandatory'.

[Example]

Better set up more chairs in the sanctuary so all the C and E folks have a place to sit.

capitation:

1. A counting of heads.

2. A uniform tax assessed by the head; a poll tax.

3. A fee extracted from each student.

caveat:

a warning or caution.

chapman:
A peddler; a merchant.

choler:

anger.

choleric:
easily angered; also, indicating or expressing anger.

Cinderella:

In sports, specifically the playoffs, a Cinderella is a team that does better than expected near the beginning and then quickly fades.

clemency:
disposition to show mercy; also, an act of mercy.

clockblock:

When you're looking forward to leaving work early or on time, but are kept late either by a new assignment from your boss or a chatty coworker.

[Example]

I was all set to rush out of work at 5:00, but then I got totally clockblocked by my boss and wound up staying till almost 7.

coeval:

existing during the same period of time; also, a contemporary.

cognoscente:

a person with special knowledge.

conspectus:

A general survey, synopsis, outline, or digest of something.

cordwainer:
A shoemaker.

cum:

with; along with; combined with.

cupidity:

eager or excessive desire, especially for wealth.