- Cobalt
- Cocercion
- Cochineal
- Cock fighting
- Cock-eyed
- Cockade
- Cockle shell
- Cockney
- Cockpit
- Coconut inflorescence
- Coconut milk
- Coconut tree
- Cocoonery
- Coda
- Cohabit
- Codes of morality
- Codicil
- Coerce
- Coexist
- Coffee bean
- Coffee shop
- Cognitive behavioural therapy
- Copula
- Copyist
- Coral island
- Corbeille
- Cord
- Cordial
- Cordial one
- Cordless
- Cords
- Core
- Cork
- Corkage
- Corker
- Corkscrew
- Corn circle
- Corn factor
- Corn-cob
- Cornice
- Coromandal coast
- Coronary arteries
- Corps
- Corpse
- Corpulence
- Corpulency
- Corpulent
- Corpulent person
- Correspond
- Correspondence
- Corridor
- Corroborant
- Corrodible
- Corrody
- Corrosion
- Corrugated iron
- Corsair
- Coruscate
- Corvette
- Cosmetic
- Cosmic rays
- Cosmogony
- Cosmopolitan
- Cosmopolite
- Cosset
- Cost
- Cost of living
- Croaky
- Cosumed
- Cot with coir matting
- Cote
- Cotton
- Cotton cake
- Cotton on to
- Cotton wool
- Couch potato
- Cough
- Council-chamber
- Counsel
- Counselled
- Count noses
- Countenance
- Counter
- Counter band goods
- Counter charge
- Counter check
- Counter march
- Counter-attraction
- Counter-temps
- Counterbalance
- Countess
- Country-greens
- County court
- County town
- Coupe
- Coupe de etat
- Couplate
- Coupon
- Courageously
- Course