poisonous nightshade vs climbing nightshade

poisonous nightshade and climbing nightshade both are nouns.

Word	Noun	Adjective	Verb	Adverb
poisonous nightshade	Yes	No	No	No
climbing nightshade	Yes	No	No	No

As nouns, poisonous nightshade and climbing nightshade are synonyms defined as:

poisonous nightshade and climbing nightshade: poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America

Other synonyms of poisonous nightshade include bittersweet, bittersweet nightshade, deadly nightshade, Solanum dulcamara, woody nightshade.

poisonous nightshade (noun)	climbing nightshade (noun)
poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America	poisonous perennial Old World vine having violet flowers and oval coral-red berries; widespread weed in North America