Quercus vaccinifolia vs shrub

Quercus vaccinifolia and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Quercus vaccinifolia	Yes	No	No	No
shrub	Yes	No	No	No

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

Quercus vaccinifolia: a low spreading or prostrate shrub of southwestern United States with small acorns and leaves resembling those of the huckleberry
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Quercus vaccinifolia include bush.

Quercus vaccinifolia (noun)	shrub (noun)
a low spreading or prostrate shrub of southwestern United States with small acorns and leaves resembling those of the huckleberry	a low woody perennial plant usually having several major stems