coca vs shrub

coca and shrub both are nouns.

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

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

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 coca include bush.

coca (noun)	shrub (noun)
dried leaves of the coca plant (and related plants that also contain cocaine); chewed by Andean people for their stimulating effect	a low woody perennial plant usually having several major stems
a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine