Solanum aviculare vs nightshade

Solanum aviculare and nightshade both are nouns.

Word	Noun	Adjective	Verb	Adverb
Solanum aviculare	Yes	No	No	No
nightshade	Yes	No	No	No

As nouns, nightshade is a hypernym of Solanum aviculare; that is, nightshade is a word with a broader meaning than Solanum aviculare:

Solanum aviculare: Australian annual sometimes cultivated for its racemes of purple flowers and edible yellow egg-shaped fruit
nightshade: any of numerous shrubs or herbs or vines of the genus Solanum; most are poisonous though many bear edible fruit

Solanum aviculare (noun)	nightshade (noun)
Australian annual sometimes cultivated for its racemes of purple flowers and edible yellow egg-shaped fruit	any of numerous shrubs or herbs or vines of the genus Solanum; most are poisonous though many bear edible fruit