budgie vs Melopsittacus undulatus

budgie and Melopsittacus undulatus both are nouns.

Word	Noun	Adjective	Verb	Adverb
budgie	Yes	No	No	No
Melopsittacus undulatus	Yes	No	No	No

As nouns, budgie and Melopsittacus undulatus are synonyms defined as:

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

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

budgie (noun)	Melopsittacus undulatus (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