parrot vs African grey

parrot and African grey both are nouns.

As nouns, African grey is a hyponym of parrot; that is, African grey is a word with a more specific, narrower meaning than parrot:

parrot: usually brightly colored zygodactyl tropical birds with short hooked beaks and the ability to mimic sounds
African grey: commonly domesticated grey parrot with red-and-black tail and white face; native to equatorial Africa

Other hyponyms of parrot include popinjay, poll, poll parrot, Psittacus erithacus, African gray, amazon, macaw, Nestor notabilis, kea, cockatoo, Nymphicus hollandicus, cockateel, cockatiel, cockatoo parrot, lovebird, lory, parakeet, paraquet, paroquet, parrakeet, parroket, parroquet.

parrot (noun)	African grey (noun)
usually brightly colored zygodactyl tropical birds with short hooked beaks and the ability to mimic sounds	commonly domesticated grey parrot with red-and-black tail and white face; native to equatorial Africa
a copycat who does not understand the words or acts being imitated

parrot (verb)	African grey (verb)
repeat mindlessly