purple boneset vs marsh milkweed

purple boneset and marsh milkweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
purple boneset	Yes	No	No	No
marsh milkweed	Yes	No	No	No

As nouns, purple boneset and marsh milkweed are synonyms defined as:

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

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

purple boneset (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