Melopsittacus undulatus vs lovebird

Melopsittacus undulatus and lovebird both are nouns.

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

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

Melopsittacus undulatus and lovebird: 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, grass parakeet, shell parakeet.

Melopsittacus undulatus (noun)	lovebird (noun)
small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors	small African parrot noted for showing affection for their mates
	small Australian parakeet usually light green with black and yellow markings in the wild but bred in many colors