- Condenser
- Condescending
- Condiment
- Condiments
- Condition
- Conditional
- Conditional probability
- Condo lent
- Condominium
- Conduct
- Cone off
- Confiscator
- Conflagration
- Conflict
- Conflicting
- Confluent
- Conform to
- Confound
- Confront
- Confronting
- Confuse with
- cryptocurrency
- Congenital heart defects
- Congeries
- Congest
- Conglomerate
- Conglomeration
- Conglutinate
- Congressional
- Congressman
- Congruity
- Conically
- Conics
- Conjectural
- Conjecture
- Conjunction of planets
- Conjure
- Conjurer
- Conk
- Connect time
- Conservation
- Conservation biology
- Conservator
- Conservatory
- Considerate
- Consist
- Consistency, consistence
- Consoles
- Consolidate
- Consultant
- Consumed
- Consumer
- Consummation
- Consumptive
- Contact
- Container
- Containing
- Containing 12
- Contemn
- Continuation
- Continuity
- Coolness
- Contractual
- Convalescence
- Convalescent
- Convenience
- Convention
- Conventional
- Conversion
- Convertible
- Convex
- Conveyance
- Cool wind
- Cooler
- Cooper
- Cop out
- Coparcenor
- Coper
- Copier
- Copious
- Copiousness
- Copper plate
- Copper sulphate
- Copper vessel
- Copra
- Copulation
- Copy
- Copycat
- Copyright
- Copywriter
- Cor
- Coracle
- Corbel
- Cordon
- Corduroys
- Corgi
- Corm
- Corporatization
- Correction
- Correction deed