- Cuban monetary unit
- Cambodian monetary unit
- Czech monetary unit
- clothes tree
- compass card
- crestless wave
- core
- cannelloni
- combined
- combinded
- complex
- cereal grass
- common wheat
- chemical mace
- chloroacetophenone
- CN gas
- coconspirator
- cannoneer
- computer operation
- computer language
- computer_oriented language
- computer readable
- computational linguistics
- Cetorhinus maximus
- cucumber tree
- chinese magnolia
- crowfoot family
- Cercidiphyllaceae
- Ceratophyllaceae
- Caulophyllum
- Cocculus
- Cananga
- Cercidiphyllum
- Ceratophyllum
- Canangium
- Chimonanthus
- Cinnamomum
- Cimicifuga
- class angiospermae
- Consolida
- class dicotyledonae
- class dicotyledones
- class magnoliopsida
- Cannabidaceae
- Convolvulaceae
- Chloranthaceae
- Combretaceae
- Cecropiaceae
- combretum family
- crowberry family