genus Sciaenops vs fish genus

genus Sciaenops and fish genus both are nouns.

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

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

genus Sciaenops: a genus of Sciaenidae, containing the fish known as the red drum, the channel bass, the redfish, the spottail bass, or the reds (Sciaenops)
fish genus: any of various genus of fish

genus Sciaenops (noun)	fish genus (noun)
a genus of Sciaenidae, containing the fish known as the red drum, the channel bass, the redfish, the spottail bass, or the reds (Sciaenops)	any of various genus of fish