Gempylus vs fish genus

Gempylus and fish genus both are nouns.

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

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

Gempylus (noun)	fish genus (noun)
type genus of the Gempylidae	any of various genus of fish