genus Lanius vs bird genus

genus Lanius and bird genus both are nouns.

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

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

genus Lanius (noun)	bird genus (noun)
type genus of the Laniidae: typical shrikes	a genus of birds