- Circumstance
- Circumvent
- Circumvention
- Circus
- Cisc
- Cissuspedafa
- Cistern
- Citadel
- Citation
- Claret
- Clarified butter
- Clarinet
- Clarinettist
- Class
- Classicist
- Classics
- Classification
- Clear-cut
- Clearing
- Clearing station
- Cleat
- Cleavable
- Cleavage
- Cleaving to
- Cleft
- Clemency
- Clepsydra
- Clergy
- Clergyman
- Cleric
- Clerodenron syphananthus
- Clever
- Clip-art
- Clip-on
- Clobber
- Clogged
- Cloistered
- Close associate
- Close cropped
- Close friend
- Close investigation
- Close over
- Clouded
- Cloudless
- Clout
- Clouted
- Clover
- Cloverleaf
- Clumsiness
- Clung
- Clunky
- Cluster
- Clustered
- Clutches
- Coarse paper
- Coarticulation
- Coastguard
- Coat
- Coating
- Coax
- Cobalt
- Cocercion
- Cochineal
- Cohabit
- Codes of morality
- Codicil
- Coerce
- Coexist
- Coffee bean
- Coffee shop
- Cognitive behavioural therapy
- Collective farm
- Collectivist
- Colleen
- Collieries
- Colliery
- Collocate
- Collocation
- Colloquial
- Colloquialism
- Combat
- Combatant
- Combatants
- Combe
- Combination
- Combination of syllables
- Combine
- Combustible
- Come between
- Come down with
- Come for
- Come home to roost
- Come to ones mind
- Come to rest
- Come up
- Come upon
- Comeback
- Comedian
- Comeliness
- Comes of good stock