Aralia spinosa vs shrub

Aralia spinosa and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aralia spinosa	Yes	No	No	No
shrub	Yes	No	No	No

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

Aralia spinosa: small deciduous clump-forming tree or shrub of eastern United States
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Aralia spinosa include bush.

Aralia spinosa (noun)	shrub (noun)
small deciduous clump-forming tree or shrub of eastern United States	a low woody perennial plant usually having several major stems