belladonna lily vs amaryllis

belladonna lily and amaryllis both are nouns.

Word	Noun	Adjective	Verb	Adverb
belladonna lily	Yes	No	No	No
amaryllis	Yes	No	No	No

As nouns, amaryllis is a hypernym of belladonna lily; that is, amaryllis is a word with a broader meaning than belladonna lily:

belladonna lily: amaryllis of South Africa often cultivated for its fragrant white or rose flowers
amaryllis: bulbous plant having showy white to reddish flowers

belladonna lily (noun)	amaryllis (noun)
amaryllis of South Africa often cultivated for its fragrant white or rose flowers	bulbous plant having showy white to reddish flowers