trumpet weed vs Eupatorium purpureum

trumpet weed and Eupatorium purpureum both are nouns.

Word	Noun	Adjective	Verb	Adverb
trumpet weed	Yes	No	No	No
Eupatorium purpureum	Yes	No	No	No

As nouns, trumpet weed and Eupatorium purpureum are synonyms defined as:

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

Other synonyms of trumpet weed include Joe-Pye weed, marsh milkweed, purple boneset.

trumpet weed (noun)	Eupatorium purpureum (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