genus Bairdiella vs fish genus

genus Bairdiella and fish genus both are nouns.

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

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

genus Bairdiella: a genus of fish in the family Sciaenidae, comprising the armed croaker, the silver perch, the swordspine croaker, the ronco croaker, the ground croaker, and bairdiella sanctaeluciae (Bairdiella)
fish genus: any of various genus of fish

genus Bairdiella (noun)	fish genus (noun)
a genus of fish in the family Sciaenidae, comprising the armed croaker, the silver perch, the swordspine croaker, the ronco croaker, the ground croaker, and bairdiella sanctaeluciae (Bairdiella)	any of various genus of fish