| climate(noun, nature, environment, earth) |
| clime(noun, nature, environment, earth) |
| clownfish(noun, animal, type, kind) |
| cobra(noun, animal, type, kind) |
| cockroach(noun, animal, type, kind) |
| cod(noun, animal, type, kind) |
| condor(noun, animal, type, kind) |
| constrictor(noun, animal, type, kind) |
| context(noun, nature, environment, earth) |
| contexture(noun, nature, environment, earth) |
| coral(noun, animal, type, kind) |
| cougar(noun, animal, type, kind) |
| cow(noun, animal, type, kind) |
| coyote(noun, animal, type, kind) |
| coypu(noun, animal, type, kind) |
| crab(noun, animal, type, kind) |
| crane(noun, animal, type, kind) |
| element(noun, environment, ecology, planet) |
| environs(noun, nature, environment, earth) |
| flora(noun, nature, water, earth) |