- cystitis
- cannot be blamed
- canonical
- canopus
- canopy
- canorous
- capitalize on
- capitulate
- capriccioso
- capricious
- caprine
- capsize
- capstone
- carbon dioxide
- carboniferous
- card
- cardinal
- carnage
- carol
- carpet
- carton
- carve out
- carve something up
- case aside
- cast
- cast a pall over
- castor oil
- castrate
- cat fish
- cataclism
- catchphrase
- categorise
- cathode
- cauliflower
- cavalry soldier
- caveat emptor
- caveman, cavewoman
- cavity
- change of scenery
- character
- characteristic
- charade
- cheer someone up
- cheer up
- cheerless
- cheers
- chef
- chicanery
- chicken out
- chickenpox
- chief god governing the elements
- child prodigy
- child safety lock
- choke
- cholecystitis
- chopfallen
- chopper
- chronic disease
- chronicle
- chronotope
- chrysoberyl
- chunky
- clamp down on
- clancining
- clang
- clapping of hands
- claque
- cleopatra ramases akhnaton tuthankhaman
- click
- click and drag
- climate
- climb
- clinical thermometer
- clip
- clip someone's wings
- clip-art
- clippers
- clitoris
- clock
- closet genius
- closing date
- cml
- co-student
- coachman
- coal bed
- coalface
- coalgate
- coalite
- coalition
- coarse
- coarse sand
- coarticulation
- coca cola
- cock fighting
- cockroach
- coconut milk
- coddle
- code of conduct
- cognizant
- cognoscente