Eupatorium purpureum vs marsh milkweed

Eupatorium purpureum and marsh milkweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Eupatorium purpureum	Yes	No	No	No
marsh milkweed	Yes	No	No	No

As nouns, Eupatorium purpureum and marsh milkweed are synonyms defined as:

Eupatorium purpureum and marsh milkweed: North American herb having whorled leaves and terminal clusters of flowers spotted with purple

Other synonyms of Eupatorium purpureum include Joe-Pye weed, purple boneset, trumpet weed.

Eupatorium purpureum (noun)	marsh milkweed (noun)
North American herb having whorled leaves and terminal clusters of flowers spotted with purple	North American herb having whorled leaves and terminal clusters of flowers spotted with purple