grass parakeet vs budgerigar

grass parakeet and budgerigar both are nouns.

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

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

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

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

grass parakeet (noun)	budgerigar (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