Grade 11.
- countertendency
- counterterrorism
- countertraction
- countertranslation
- countertreason
- countervailing
- countervibration
- countrification
- couture
- cox
- crashworthiness
- credence
- creditableness
- criminalistics
- criminologists
- criminology
- crocket
- crookshouldered
- crossfertilizable
- crossopterygian