- Cuscuta reflexa Roxb
- Cuss
- Custard pie
- Custodian
- Custodianship
- Customarily
- Customer relation
- Customize
- Cut down
- Cut from underground
- Cut glass
- Cyclist
- Cyclone
- Cylindrical
- Cymbals
- Cynophilist
- Cyperus
- Cyperus rotendus
- Cypher
- Cyprinid
- Cystic fibrosis
- Cystitis
- Cytology
- Czar
- Cryptography
- Cryptology
- Crysanthus
- Cyclostyle
- Concuss
- Cozenger
- Cabal
- Cabalist
- Cabbage
- Cabernet
- Cain
- Calaboose
- Calamari
- Calcareous
- Calcification
- Calcium
- Calefaction
- Calendar
- Calendar month
- Caliber
- Calibre
- Calico
- Caliph
- Caliphate
- Calisthenics
- Call
- Call a spade a spade
- Call girl
- Call of prayer
- Call off
- Call person names
- Call to order
- Call up
- Callon
- Camper
- Campesinos
- Campment
- Canaille
- Canarese
- Cancer
- Cancroids
- Candidly
- Candidness
- Candor
- Candour
- Canine
- Canticle
- Canto
- Canton
- Canvasser
- Canyon
- Cap
- Cap in hand
- Caparison
- Capitalistic
- Caraway
- Carbide
- Carbohydrate
- Carbolic
- Carbon
- Carbon dioxide
- Carbonic
- Carboy
- Carburettor
- Cpm
- Card game
- Card table
- Cardigan
- Carry on
- Carry weight
- Carry with one
- Cart
- Cart horse
- Cart-pole
- Cartel
- Carter