genus Otus vs bird genus

genus Otus and bird genus both are nouns.

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

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

genus Otus (noun)	bird genus (noun)
a genus of Strigidae containing the Scops owl (Otus)	a genus of birds