Vincetoxicum hirsutum vs Vincetoxicum negrum

Vincetoxicum hirsutum and Vincetoxicum negrum both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vincetoxicum hirsutum	Yes	No	No	No
Vincetoxicum negrum	Yes	No	No	No

As nouns, Vincetoxicum hirsutum and Vincetoxicum negrum are synonyms defined as:

Vincetoxicum hirsutum and Vincetoxicum negrum: twining vine with hairy foliage and dark purplish-brown flowers

Other synonyms of Vincetoxicum hirsutum include negro vine.

Vincetoxicum hirsutum (noun)	Vincetoxicum negrum (noun)
twining vine with hairy foliage and dark purplish-brown flowers	twining vine with hairy foliage and dark purplish-brown flowers