Cove
Cantering, capering, clearing
There is no such word as I am aware. For words that end in "r," a tornado may informally be called a twister. Some people call tornadoes cyclones, but this is technically incorrect.
Contentment
Crush
Car is another word for truck that starts with a "c".
consomme
Credenza
cabana
casa
civilianscommonerschaps
Catastrophic
A synonym for liar that starts with "c" is "deceiver."
converse.
Cove
Chilly, coldish
celebration