| cay | (noun) a coral reef off the southern coast of Florida | Synonyms: Florida key, key |
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| cayenne | (noun) ground pods and seeds of pungent red peppers of the genus Capsicum | Synonyms: cayenne pepper, red pepper |
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| (noun) a long and often twisted hot red pepper | Synonyms: cayenne pepper |
| (noun) plant bearing very hot and finely tapering long peppers; usually red | Synonyms: Capsicum annuum longum, cayenne pepper, chili pepper, chilli pepper, jalapeno, long pepper |
| cayman | (noun) a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly | Synonyms: caiman |
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| cayuse | (noun) a small native range horse | Synonyms: Indian pony |
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| decay | (noun) the organic phenomenon of rotting | Synonyms: decomposition |
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| (noun) a gradual decrease; as of stored charge or current | Synonyms: decline |
| (noun) the process of gradually becoming inferior | - |
| (noun) the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation | Synonyms: disintegration, radioactive decay |
| (noun) an inferior state resulting from the process of decaying | - |
| (verb) fall into decay or ruin | Synonyms: crumble, dilapidate |
| (verb) lose a stored charge, magnetic flux, or current | Synonyms: decompose, disintegrate |
| (verb) undergo decay or decomposition | - |
| decayable | (adjective) liable to decay or spoil or become putrid | Synonyms: putrefiable, putrescible, spoilable |
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| decayed | (adjective) damaged by decay; hence unsound and useless | Synonyms: rotted, rotten |
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| picayune | (adjective) (informal) small and of little importance | Synonyms: fiddling, footling, lilliputian, little, niggling, petty, piddling, piffling, trivial |
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| vacay | (noun) informal term for vacation | Synonyms: vac |
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