genus Erythroxylon vs Erythroxylum

genus Erythroxylon and Erythroxylum both are nouns.

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

As nouns, genus Erythroxylon and Erythroxylum are synonyms defined as:

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

Other synonyms of genus Erythroxylon include Erythroxylon, genus Erythroxylum.

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