Betula vs genus Betula

Betula and genus Betula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Betula	Yes	No	No	No
genus Betula	Yes	No	No	No

As nouns, Betula and genus Betula are synonyms defined as:

Betula and genus Betula: a genus of trees of the family Betulaceae (such as birches)

Betula (noun)	genus Betula (noun)
a genus of trees of the family Betulaceae (such as birches)	a genus of trees of the family Betulaceae (such as birches)