coca plant vs Erythroxylon coca

coca plant and Erythroxylon coca both are nouns.

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

As nouns, coca plant and Erythroxylon coca are synonyms defined as:

coca plant and Erythroxylon coca: a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine

Other synonyms of coca plant include coca.

coca plant (noun)	Erythroxylon coca (noun)
a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine	a South American shrub whose leaves are chewed by natives of the Andes; a source of cocaine