Agonus vs fish genus

Agonus and fish genus both are nouns.

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

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

Agonus (noun)	fish genus (noun)
type genus of the Agonidae	any of various genus of fish