Common words:
* correct: right, accurate, true
* corrupt: dishonest, immoral, decayed
* correspond: match, agree, communicate
* correlate: relate, connect, associate
* corporation: a large company or group of people
* courage: bravery, boldness, confidence
Less common words:
* cordial: warm, friendly, sincere
* cornucopia: abundance, plenty, overflowing
* corollary: a consequence, a natural result
* corpulent: fat, obese, stout
* corroborate: confirm, support, verify
* corrode: eat away, wear down, destroy
* coruscate: sparkle, glitter, flash
* cortex: the outer layer of something, especially the brain
Note: The prefix "cor-" usually comes from the Latin word "cor," meaning "heart." This explains why many of these words have connotations related to things like truth, courage, and integrity.