- Client
- Cliff-hanger
- Climatic
- Climatics
- Climax
- Climb
- Climbable
- Climbing
- Cline
- Clinic
- Clinical thermometer
- Clinker
- Clinquant
- Clipboard
- Clique
- Cliquish
- Clitic
- clitoridectomy
- Clitoris
- Clock
- Clockwise
- Clog
- Clogging
- Clone
- Clonk
- Close
- Close in
- Cloudburst
- Cloudy
- Cloudy sky
- Clough
- Cloy
- Clue
- Clumpy
- Clunk
- Cluster of lotus flower
- Cluster of desoms
- Clutch
- Clutter up
- Clyster
- Coalmine
- Coarse sand
- Coarsen
- Coarseness
- Coast of coromandal
- Coastal
- Coaster
- Coastline
- Cobbler-smith
- Coca cola
- Coccinia grandis
- Coccyx
- Cochin
- Cock crow
- Codeine
- Coercive
- Coeval
- Coexistence
- Coffee
- Coffee house
- Cog
- Cognition
- Cognitive
- Cognizance
- Cognizant
- Cold shoulder
- Cold sore
- Coldly
- Coldness
- Colic
- Collaborator
- Collagen
- Collateral
- Collect
- Collectable
- Collection
- Collective bargaining
- Collectivism
- Collector
- Collectorate
- Collegiate
- Collier
- Collimate
- Collogue
- Colloquium
- Colluctation
- Collude
- Collusion
- Colombo
- Coma
- Comaberenices
- Combo
- Combustion
- Come after
- Come clean
- Come down
- Come down on one side of the fence or other
- Come down with a run
- Come hell or high water
- Come to naught