genus Aramus vs bird genus

genus Aramus and bird genus both are nouns.

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

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

genus Aramus: genus of large brown long-billed wading birds found in warm swampy regions of the western hemisphere: courlan; limpkin
bird genus: a genus of birds

genus Aramus (noun)	bird genus (noun)
genus of large brown long-billed wading birds found in warm swampy regions of the western hemisphere: courlan; limpkin	a genus of birds