genus Protoavis vs bird genus

genus Protoavis and bird genus both are nouns.

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

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

genus Protoavis: extinct primitive birds of the Triassic period; 70 million years before archaeopteryx
bird genus: a genus of birds

genus Protoavis (noun)	bird genus (noun)
extinct primitive birds of the Triassic period; 70 million years before archaeopteryx	a genus of birds