- Costly
- Costume
- Costume designer
- Costumer
- Costus
- Cot
- Coterminous
- Cottage
- Cottage industry
- Cotter
- Cotton planks
- Cotyledon
- Couch
- Couchant
- Could
- Coulter
- Counter-productive
- Counteract
- Counteraction
- Counterculture
- Counterfoil
- Countermeasure
- Counterpoint
- Country
- Country-made
- Countryman
- Countryside
- County clerk
- County council
- Coverlet
- Covert
- Covertures
- Covetously
- Cow
- Cow lick
- Cow sacrifice
- Cow-dung beetle
- Cow-herd-woman
- Cowardly
- Cowherds
- Cowhide
- Craftmanship
- Craftsmanship
- Crafty plan
- Craggy
- Crammer
- Cranberry
- Crank
- Cranky
- Crappy
- Crass
- Craving for food
- Creeping
- Cremate
- Crematory
- Crenellated
- Creosote
- Crescent
- Cress
- Cretinism
- Crew
- Cribbage
- Crick
- Crooked
- Crop circle
- Croquis
- Crore
- Cross breed
- Cross eye
- Cross the rubicon
- Cross-border
- Cross-check
- Crouton
- Crowing
- Crowning
- Crupper
- Crude castor oil
- Crudites
- Crudity
- Cruel
- Cubs
- Cry wolf
- Crystalline
- Crystallized
- Crystallography
- Ctrl
- Cubbyhole
- Cube
- Cubist
- Cubit
- Cumber
- Cunning
- Cunning person
- Cunningly
- Cunt
- Cup
- Cup final
- Cup-cake
- Cupboard
- Cupful