Cantering, capering, clearing
Cove
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.
complicated
Crush
Contentment
Car is another word for truck that starts with a "c".
consomme
casa
Credenza
civilianscommonerschaps
Catastrophic
cabana
Chilly, coldish
consequence
Cove
converse.
A synonym for liar that starts with "c" is "deceiver."