genus Elagatis vs fish genus

genus Elagatis and fish genus both are nouns.

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

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

genus Elagatis: a genus of Carangidae, containing the rainbow runner (Elagatis)
fish genus: any of various genus of fish

genus Elagatis (noun)	fish genus (noun)
a genus of Carangidae, containing the rainbow runner (Elagatis)	any of various genus of fish