Erythroxylum vs plant genus

Erythroxylum and plant genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Erythroxylum	Yes	No	No	No
plant genus	Yes	No	No	No

As nouns, plant genus is a hypernym of Erythroxylum; that is, plant genus is a word with a broader meaning than Erythroxylum:

Erythroxylum: a large genus of South American shrubs and small trees of the family Erythroxylaceae
plant genus: a genus of plants

Erythroxylum (noun)	plant genus (noun)
a large genus of South American shrubs and small trees of the family Erythroxylaceae	a genus of plants