Baccharis pilularis vs shrub

Baccharis pilularis and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Baccharis pilularis	Yes	No	No	No
shrub	Yes	No	No	No

As nouns, shrub is a hypernym of Baccharis pilularis; that is, shrub is a word with a broader meaning than Baccharis pilularis:

Baccharis pilularis: widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Baccharis pilularis include bush.

Baccharis pilularis (noun)	shrub (noun)
widely spreading evergreen shrub of southwestern United States with flower heads in a leafy panicle	a low woody perennial plant usually having several major stems