Opisthocomus hoazin vs hoatzin

Opisthocomus hoazin and hoatzin both are nouns.

Word	Noun	Adjective	Verb	Adverb
Opisthocomus hoazin	Yes	No	No	No
hoatzin	Yes	No	No	No

As nouns, Opisthocomus hoazin and hoatzin are synonyms defined as:

Opisthocomus hoazin and hoatzin: crested ill-smelling South American bird whose young have claws on the first and second digits of the wings

Other synonyms of Opisthocomus hoazin include hoactzin, stinkbird.

Opisthocomus hoazin (noun)	hoatzin (noun)
crested ill-smelling South American bird whose young have claws on the first and second digits of the wings	crested ill-smelling South American bird whose young have claws on the first and second digits of the wings