budgerigar vs grass parakeet

budgerigar and grass parakeet both are nouns.

Word	Noun	Adjective	Verb	Adverb
budgerigar	Yes	No	No	No
grass parakeet	Yes	No	No	No

As nouns, budgerigar and grass parakeet are synonyms defined as:

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

budgerigar (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