- Concavo-convex
- Cottons
- Couchette
- Cottony
- Counted
- Counteracting
- Counter-attack
- Counter-espionage
- Counter-revolution
- Counterrevolutionary
- Courses
- Court-martial
- Coven
- Cover-up
- Coverts
- Crabby
- Crack-brained
- Cone-bearing
- Conferring
- Cramps
- Crankcase
- Cranked
- Congratulated
- Crash-land
- Conjectured
- Cratered
- Connatural
- Conscience-stricken
- Creating
- Credited
- Crediting
- Creepers
- Crenelated
- Consoled
- Crisped
- Cross-breed
- Cross-country
- Cross-eyed
- Cross-examination
- Cross-fertilization
- Cross-grained
- Cross-purpose
- Cross-question
- Constrainedly
- Crouching