prairie sage vs western mugwort

prairie sage and western mugwort both are nouns.

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

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

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

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

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