Bubo vs bird genus

Bubo and bird genus both are nouns.

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

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

Bubo: a genus of Strigidae containing the American horned owls and the Old World eagle-owls (Bubo)
bird genus: a genus of birds

Bubo (noun)	bird genus (noun)
a genus of Strigidae containing the American horned owls and the Old World eagle-owls (Bubo)	a genus of birds