genus Melanerpes vs bird genus

genus Melanerpes and bird genus both are nouns.

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

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

genus Melanerpes: a genus of Picidae, containing woodpeckers found in the New World (Melanerpes)
bird genus: a genus of birds

genus Melanerpes (noun)	bird genus (noun)
a genus of Picidae, containing woodpeckers found in the New World (Melanerpes)	a genus of birds