- Coalescence
- Coalface
- Coalite
- Cock-a-hoop
- Cock-crest
- Cockatoo
- Cockerel
- Cockernony
- Cockle
- Cocky
- Cocoa
- Coconut leaves
- Coconut oil
- Coconut palm
- Coconut toddy
- Cod
- Coddiwomple
- Coherence
- Coherent
- Coherently
- Cohesion
- Coiffure
- Coinage
- Coincide
- Coincidence
- Coincidental
- Coir fibre
- Coital
- Coitus
- Colander
- Cold
- Cold comfort
- Collectible
- Collecting
- Collection of a part of produce as tax
- Collective
- Collectivize
- Collegial
- Collide
- Collie
- Collinear
- Colloquial usage
- Colloquy
- Collywobbles
- Colonitis
- Colony
- Colorful
- Colors
- Colossal
- Colostrums
- Colour box
- Colourist
- Colours
- Column
- Columnar
- Com
- Com and go
- Come into force
- Come on
- Come thick and fast
- Come to aid
- Come to an end
- Come to blows
- Come to life
- Come to light
- Coming on
- Comity
- Command
- Commandant
- Commenator
- Commencement
- Commend
- Commendation
- Commerce
- Commercially
- Common-mans
- Commonalty
- Communal
- Communalist
- Communicate
- Communist army
- Community health centre
- Commutator
- Commuter
- Compact
- Competitive
- Compile
- Compiler
- Complain
- Complementary
- Complementary operation
- Completely
- Compress
- Compulsive
- Compulsory
- Computer science
- Con
- Concealed
- Concede defeat
- Conceit