genus Genyonemus vs fish genus

genus Genyonemus and fish genus both are nouns.

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

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

genus Genyonemus: a genus of Sciaenidae, containing the fish known as the white croaker, the Pasadena trout, the tommy croaker, and the little bass (Genyonemus)
fish genus: any of various genus of fish

genus Genyonemus (noun)	fish genus (noun)
a genus of Sciaenidae, containing the fish known as the white croaker, the Pasadena trout, the tommy croaker, and the little bass (Genyonemus)	any of various genus of fish