cockatiel vs cockatoo parrot

cockatiel and cockatoo parrot both are nouns.

Word	Noun	Adjective	Verb	Adverb
cockatiel	Yes	No	No	No
cockatoo parrot	Yes	No	No	No

As nouns, cockatiel and cockatoo parrot are synonyms defined as:

cockatiel and cockatoo parrot: small grey Australian parrot with a yellow crested head

Other synonyms of cockatiel include cockateel, Nymphicus hollandicus.

cockatiel (noun)	cockatoo parrot (noun)
small grey Australian parrot with a yellow crested head	small grey Australian parrot with a yellow crested head