Sorbus vs genus Sorbus

Sorbus and genus Sorbus both are nouns.

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

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

Sorbus and genus Sorbus: a genus of shrubs or trees of the family Rosaceae having feathery leaves

Sorbus (noun)	genus Sorbus (noun)
a genus of shrubs or trees of the family Rosaceae having feathery leaves	a genus of shrubs or trees of the family Rosaceae having feathery leaves