- cyanocitta cristata
- cyanogenetic
- choloepus
- cobalt
- cob
- clarifying
- clarinet section
- cocotte
- Cinderella
- coquette
- cyprian
- char
- cleaning lady
- cleaning woman
- charwoman
- cleaner
- character
- clam
- copper
- cesium
- Cd
- Cf
- Ce
- Co
- Cs
- Cr
- Cu
- cerium
- curium
- californium
- chromium
- crux of the matter
- cry baby
- call out
- cry out
- catchword
- cry off
- cry down
- cry wolf
- cry of joy
- chirrup
- cluck
- click
- cronk
- chirp
- churr
- chorus
- coo
- crow
- croak