western mugwort vs prairie sage

western mugwort and prairie sage both are nouns.

Word	Noun	Adjective	Verb	Adverb
western mugwort	Yes	No	No	No
prairie sage	Yes	No	No	No

As nouns, western mugwort and prairie sage are synonyms defined as:

western mugwort and prairie sage: perennial cottony-white herb of southwestern United States

Other synonyms of western mugwort include Artemisia gnaphalodes, Artemisia ludoviciana, cudweed, white sage.

western mugwort (noun)	prairie sage (noun)
perennial cottony-white herb of southwestern United States	perennial cottony-white herb of southwestern United States