shell parakeet vs budgerigar

shell parakeet and budgerigar both are nouns.

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

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

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

shell 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