African grey vs Psittacus erithacus

African grey and Psittacus erithacus both are nouns.

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

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

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

Other synonyms of African grey include African gray.

African grey (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