bittersweet vs genus Celastrus

bittersweet and genus Celastrus both are nouns.

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

bittersweet (noun)	genus Celastrus (noun)
twining shrub of North America having yellow capsules enclosing scarlet seeds	genus of woody vines and erect shrubs (type genus of the Celastraceae) that is native chiefly to Asia and Australia: includes bittersweet
poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America

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