white sage vs western mugwort

white sage and western mugwort both are nouns.

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

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

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

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

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