coyote brush vs coyote bush

coyote brush and coyote bush both are nouns.

Word	Noun	Adjective	Verb	Adverb
coyote brush	Yes	No	No	No
coyote bush	Yes	No	No	No

As nouns, coyote brush and coyote bush are synonyms defined as:

coyote brush and coyote bush: widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle

Other synonyms of coyote brush include Baccharis pilularis, chaparral broom, kidney wort.

coyote brush (noun)	coyote bush (noun)
widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle	widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle