C
cite, site, sight--A reference is cited. A site is a place. Sight
is vision.
compare to, compare with--Compare to means "assert a likeness."
He compared the precipitate to chocolate
pudding; both are brown and gooey.
He compared the precipitate with chocolate
pudding to decide which one tasted better.
complement, compliment--Complement implies something that
completes. A compliment is flattery or praise.
compose, comprise, consist of, include--Parts compose a whole. A
whole consists of or comprises parts. Comprise may refer
to all parts or only major parts. Consist means that all parts are
listed, but include does not.
Cement, aggregate, and water compose concrete. Concrete
is composed of cement, aggregate, and water.
Concrete comprises (or consists of) cement,
aggregate, and water. Concrete includes cement and aggregate.
Is comprised of is always
incorrect.
consensus--Consensus means "general agreement" or "collective
opinion." The word relates to sense and has no connection with census. The
phrases "consensus of opinion" and "general consensus" are
redundant.
continual, continuous--Continual means "intermittent" or "repeated
at intervals." Continuous means "without interruption" or "unbroken." | 
