genus Carcharias vs fish genus

genus Carcharias and fish genus both are nouns.

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

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

genus Carcharias (noun)	fish genus (noun)
type and sole genus of Carchariidae: sand sharks	any of various genus of fish