genus Troglodytes vs bird genus

genus Troglodytes and bird genus both are nouns.

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

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

genus Troglodytes (noun)	bird genus (noun)
type genus of the Troglodytidae	a genus of birds