- Civilly
- Civilians
- Canty
- Clamped
- Clamp-down
- Caprine
- Class-conscious
- Carburet
- Clastic
- Clattered
- Clausal
- Claw-hammer
- Card-sharper
- Clean-handed
- Clean-limbed
- Clean-shaven
- Clear-cut
- Clear-headed
- Clear-sighted
- Clear-eyed
- Carpet-sweeper
- Carpet-bagger
- Clerihew
- Carrots
- Carry-over
- Carvel-built
- Cliff-hanger
- Case-hardened
- Clips
- Climb-down
- Clock-watching
- Cloak-and-dagger
- Cast-iron
- Collapsed
- Cast-off
- Close-grained
- Close-set
- Clothes-peg
- Clothes-pin
- Cloud cover
- Cloud-cuckoo-land
- Catafalque
- Consulting
- Contacted
- Club-foot
- Coal-black
- Catch red-handed
- Coarse-grained
- Coarsened
- Catchpenny