- Cleric
- Clerodenron syphananthus
- Clever
- Close rank
- Close round
- Close to
- Close-fitting
- Closed place
- Closefisted
- Closely built
- Closet genius
- Closing as flowers
- Clot
- Cloth purse
- Clothline
- Coarse paper
- Coarticulation
- Coastguard
- Coat
- Coating
- Coax
- Cobalt
- Cocercion
- Cochineal
- Cock fighting
- Cock-eyed
- Cockade
- Cockle shell
- Cockney
- Cockpit
- Coconut inflorescence
- Coconut milk
- Coconut tree
- Cocoonery
- Coda
- Cold snap
- Cold sweat
- Cold wave
- Cole
- Colicky
- Collaboration
- Collaborators
- Collar
- Collateral damage
- Collected
- Colonisation
- Colonise
- Colonist
- Colonnade
- Coloquial
- Color
- Coloring
- Colossus
- Colour blind
- Colour brine
- Colour line
- Colourfully
- Come in
- Come in for
- Come into line
- Come into ones mind
- Come into or enter ones head
- Come near
- Come off
- Come out of
- Come rain , come shine
- Come round
- Come short
- Come to a conclusion
- Come to hand
- Come to mind
- Comparable
- Compass
- Compatibility
- Compatibleness, compatibility
- Compere
- Compete
- Competent for
- Comprehensive
- Comprehensively
- Compressibility
- Compression
- Compressor
- Comprise
- Computation
- Computerised
- Computerized
- Conation
- Concealing
- Concealment
- Concealment of truth
- Concision
- Conclusion
- Conclusively proved
- Concoct
- Concord
- Concrastination
- Concubinage
- Concupiscence
- Concur