manzanita vs shrub

manzanita and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
manzanita	Yes	No	No	No
shrub	Yes	No	No	No

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

manzanita: chiefly evergreen shrubs of warm dry areas of western North America
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of manzanita include bush.

manzanita (noun)	shrub (noun)
chiefly evergreen shrubs of warm dry areas of western North America	a low woody perennial plant usually having several major stems
evergreen tree of the Pacific coast of North America having glossy leathery leaves and orange-red edible berries; wood used for furniture and bark for tanning