- Clinic
- Clinical thermometer
- Close up
- Close-set
- Closing date
- Clot buster
- Cloth
- Cloth for onam
- Co-action
- Co-brother
- Co-brother-in-law
- Co-extensive
- Co-habiting
- Co-student
- Coadjutant
- Coal field
- Coal-black
- Coalesce
- Codeine
- Coercive
- Coeval
- Coexistence
- Coffee
- Coffee house
- Cog
- Cognition
- Cognitive
- Cognizance
- Cognizant
- Cold shoulder
- Cold sore
- Coldly
- Coldness
- Colic
- Collaborator
- Collagen
- Collateral
- Collect
- Collectable
- Colonel
- Coloration
- Colorless
- Colour
- Colouration
- Coloured
- Colourful
- Colourless
- Colporteur
- Colubrine
- Columnist
- Come to naught
- Come to nothing
- Come to pass
- Come to the point
- Come unglued
- Comedy
- Comforted
- Comfy
- Coming
- Commissariat
- Commission agency
- Commissioner
- Commit oneself to
- Commiting suicide
- Commitment
- Committable
- Committed
- Committer
- Commode
- Commodify
- Commodiously, commodiousness
- Commodity
- Common
- Common carraaway
- Common cold
- Common knowledge
- Competently
- Competition
- Compiled
- Complacency
- Complacent
- Complainant
- Complaisance
- Complement
- Complete non-existence
- Complicate
- Complication
- Compressible
- Compromise
- Comptroller
- Compulsion
- Computing element
- Comradeship
- Concave
- Conceal
- Cpu
- Conciliation
- Conciliatory
- Concise
- Conclude