Caiman
Part of speech: noun
Definition: A relative of the alligator, of the genus Caiman. A semi-aquatic lizard, of the genus Dracaena, found in South America. To differentiate from caimans they are referred to as caiman lizards.
Cayman
Part of speech: noun
Definition: Any of the relatively small crocodilians of genus Caiman, within family Alligatoridae.