Synonyms starting with "C":
* Calm and tranquil
* Correct and accurate
* Clever and intelligent
* Commence and begin
* Conceal and hide
Antonyms starting with "C":
* Calm and chaotic
* Correct and incorrect
* Cold and hot
* Clean and dirty
* Close and open
Homonyms starting with "C":
* Cell (a small room) and cell (a basic unit of life)
* Course (a path) and course (a series of lessons)
* Cast (to throw) and cast (a group of actors)
* Cite (to quote) and site (a location)
* Complement (to enhance) and compliment (to praise)