hoatzin vs Opisthocomus hoazin

hoatzin and Opisthocomus hoazin both are nouns.

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

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

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

Other synonyms of hoatzin include hoactzin, stinkbird.

hoatzin (noun)	Opisthocomus hoazin (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