genus Aulostomus vs fish genus

genus Aulostomus and fish genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Aulostomus	Yes	No	No	No
fish genus	Yes	No	No	No

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

genus Aulostomus (noun)	fish genus (noun)
type genus of the Aulostomidae	any of various genus of fish