Corvus vs bird genus

Corvus and bird genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Corvus	Yes	No	No	No
bird genus	Yes	No	No	No

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

Corvus (noun)	bird genus (noun)
type genus of the Corvidae: crows and ravens	a genus of birds
a small quadrilateral constellation in the Southern Hemisphere near Virgo