African gray vs Psittacus erithacus

African gray and Psittacus erithacus both are nouns.

Word	Noun	Adjective	Verb	Adverb
African gray	Yes	No	No	No
Psittacus erithacus	Yes	No	No	No

As nouns, African gray and Psittacus erithacus are synonyms defined as:

African gray and Psittacus erithacus: commonly domesticated grey parrot with red-and-black tail and white face; native to equatorial Africa

Other synonyms of African gray include African grey.

African gray (noun)	Psittacus erithacus (noun)
commonly domesticated grey parrot with red-and-black tail and white face; native to equatorial Africa	commonly domesticated grey parrot with red-and-black tail and white face; native to equatorial Africa