- Coronary artery
- Coronary thrombosis
- Coronation
- Corporatization
- Correction
- Correction deed
- Correctly
- Correctness
- Correlative
- Correspondent
- Corresponding
- Corrigendum
- Corroborative
- Corroboratory
- Corrode
- Corrugate
- Corsage
- Corselet
- Coruscation
- Coryza
- Cosmetic preparation
- Cosmogonal suktha
- Cosmography
- Cosmological
- Cosmology
- Cost-benefit
- Costs
- Costume jewellery
- Cosy
- Cottager
- Cotton up
- Coumarone
- Counseller
- Counselling
- Countdown
- Counter plea
- Counter-acting
- Counter-intelligence
- Counter-tenor
- Counterfeit
- Counterfeit note
- Counterpoise
- Countersign
- Counterstrike
- Countervailing
- Counting
- Countrified
- Country club
- Country-craft
- Coup de grace
- Couple
- Courses
- Court of law
- Courtesies
- Courtliness
- Courtly
- Coverage
- Coverity
- Covers
- Cow-dung
- Cow-dung heap
- Coward
- Cowcatcher
- Cowdung cake
- Cowherd
- Cowl
- Cowpea pods
- Cows
- Coxswain
- Coy
- Crab
- Crabber
- Crack a joke
- Crack brained
- Cracked
- Cracking sound
- Craftiness
- Craftsman
- Cram
- Cramp
- Crampon
- Crankily
- Cranny
- Crap
- Crape
- Crash
- Crash helmet
- Crave
- Craving
- Crawlingly
- Crazy
- Crc
- Creamy
- Create
- Creche
- Credence
- Credit
- Creeper
- Creepers
- Cremation