parrot vs cockateel

parrot and cockateel both are nouns.

As nouns, cockateel is a hyponym of parrot; that is, cockateel 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
cockateel: small grey Australian parrot with a yellow crested head

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

parrot (noun)	cockateel (noun)
usually brightly colored zygodactyl tropical birds with short hooked beaks and the ability to mimic sounds	small grey Australian parrot with a yellow crested head
a copycat who does not understand the words or acts being imitated

parrot (verb)	cockateel (verb)
repeat mindlessly