Nymphicus hollandicus vs cockatiel

Nymphicus hollandicus and cockatiel both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nymphicus hollandicus	Yes	No	No	No
cockatiel	Yes	No	No	No

As nouns, Nymphicus hollandicus and cockatiel are synonyms defined as:

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

Other synonyms of Nymphicus hollandicus include cockateel, cockatoo parrot.

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