Baccharis halimifolia vs shrub

Baccharis halimifolia and shrub both are nouns.

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

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

Baccharis halimifolia: a shrub of salt marshes of eastern and south central North America and West Indies; fruit is surrounded with white plumelike hairy tufts
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Baccharis halimifolia include bush.

Baccharis halimifolia (noun)	shrub (noun)
a shrub of salt marshes of eastern and south central North America and West Indies; fruit is surrounded with white plumelike hairy tufts	a low woody perennial plant usually having several major stems