Lycium carolinianum vs shrub

Lycium carolinianum and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lycium carolinianum	Yes	No	No	No
shrub	Yes	No	No	No

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

Lycium carolinianum: spiny evergreen shrub of southeastern United States having spreading branches usually blue or mauve flowers and red berries
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Lycium carolinianum include bush.

Lycium carolinianum (noun)	shrub (noun)
spiny evergreen shrub of southeastern United States having spreading branches usually blue or mauve flowers and red berries	a low woody perennial plant usually having several major stems