genus Sphyrapicus vs bird genus

genus Sphyrapicus and bird genus both are nouns.

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

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

genus Sphyrapicus: a genus of Picidae, containing the sapsuckers (Sphyrapicus)
bird genus: a genus of birds

genus Sphyrapicus (noun)	bird genus (noun)
a genus of Picidae, containing the sapsuckers (Sphyrapicus)	a genus of birds