genus Athene vs bird genus

genus Athene and bird genus both are nouns.

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

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

genus Athene: a genus of Strigidae containing the spotted owlet, little owl, forest owlet, and burrowing owl (Athene)
bird genus: a genus of birds

genus Athene (noun)	bird genus (noun)
a genus of Strigidae containing the spotted owlet, little owl, forest owlet, and burrowing owl (Athene)	a genus of birds