nightshade vs woody plant

nightshade and woody plant both are nouns.

Word	Noun	Adjective	Verb	Adverb
nightshade	Yes	No	No	No
woody plant	Yes	No	No	No

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

nightshade: any of numerous shrubs or herbs or vines of the genus Solanum; most are poisonous though many bear edible fruit
woody plant: a plant having hard lignified tissues or woody parts especially stems

Other hypernyms of nightshade include ligneous plant.

nightshade (noun)	woody plant (noun)
any of numerous shrubs or herbs or vines of the genus Solanum; most are poisonous though many bear edible fruit	a plant having hard lignified tissues or woody parts especially stems