bittersweet vs genus Solanum

bittersweet and genus Solanum both are nouns.

Word	Noun	Adjective	Verb	Adverb
bittersweet	Yes	Yes	No	No
genus Solanum	Yes	No	No	No

bittersweet (noun)	genus Solanum (noun)
twining shrub of North America having yellow capsules enclosing scarlet seeds	type genus of the Solanaceae: nightshade, potato, eggplant, bittersweet
poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America

bittersweet (adjective)	genus Solanum (adjective)
tinged with sadness
having a taste that is a mixture of bitterness and sweetness