Erythroxylon coca vs shrub

Erythroxylon coca and shrub both are nouns.

Word	Noun	Adjective	Verb	Adverb
Erythroxylon coca	Yes	No	No	No
shrub	Yes	No	No	No

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

Erythroxylon coca: a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine
shrub: a low woody perennial plant usually having several major stems

Other hypernyms of Erythroxylon coca include bush.

Erythroxylon coca (noun)	shrub (noun)
a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine	a low woody perennial plant usually having several major stems