caiman vs cayman

caiman and cayman both are nouns.

Word	Noun	Adjective	Verb	Adverb
caiman	Yes	No	No	No
cayman	Yes	No	No	No

As nouns, caiman and cayman are synonyms defined as:

caiman and cayman: a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly

caiman (noun)	cayman (noun)
a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly	a semiaquatic reptile of Central and South America that resembles an alligator but has a more heavily armored belly