Melopsittacus undulatus vs grass parakeet

Melopsittacus undulatus and grass parakeet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Melopsittacus undulatus	Yes	No	No	No
grass parakeet	Yes	No	No	No

As nouns, Melopsittacus undulatus and grass parakeet are synonyms defined as:

Melopsittacus undulatus and grass parakeet: small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors

Other synonyms of Melopsittacus undulatus include budgereegah, budgerigar, budgerygah, budgie, lovebird, shell parakeet.

Melopsittacus undulatus (noun)	grass parakeet (noun)
small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors	small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors