marsh milkweed vs trumpet weed

marsh milkweed and trumpet weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
marsh milkweed	Yes	No	No	No
trumpet weed	Yes	No	No	No

As nouns, marsh milkweed and trumpet weed are synonyms defined as:

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

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

marsh milkweed (noun)	trumpet weed (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