- Commensurable ness
- Commentary
- Commentate, commentator
- Commercial
- Commiseration
- Common sense
- Communalism
- Communicable
- Communication
- Communication satellite
- Comorbid
- Compliment
- Components
- Comport with
- Composes
- Composing
- Compositions
- Compound interest
- Compound wall
- Compoundable offence
- Conceited
- Conceive
- Conceived
- Concentrate
- Concentrically
- Concerned
- Concerned about
- Concerted
- Concertina
- Conciliate
- Confabulate
- Confederate
- Confessant
- Confessional
- Confined at the surface
- Confinement
- Confirm
- Confiscating
- Congressional
- Congressman
- Congruity
- Conically
- Conics
- Conjectural
- Conjecture
- Conjunction of planets
- Conjure
- Conjurer
- Conk
- Connect time
- Conspiracy
- Constabulary
- Consternate
- Consternation
- Constituency
- Construct
- Constructed in front of mansions
- Consulate
- Contemplative
- Contempt of court
- Contemptuousness
- Contender
- Cordate
- Conterminous
- Contextualise
- Contexture
- Continence
- Contravention
- Contribute
- Contributor
- Contrite
- Controls
- Controversialist
- Contumely
- Coprology
- Cool wind
- Cooler
- Cooper
- Cop out
- Coparcenor
- Coper
- Copier
- Copious
- Copiousness
- Copper plate
- Copper sulphate
- Copper vessel
- Copra
- Corn
- Corn exchange
- Corn heap
- Corn pone
- Cornal desire
- Cornea
- Cornelian
- Cornered
- Cornet
- Cornucopia
- Corolla
- Corona