genus Brama vs fish genus

genus Brama and fish genus both are nouns.

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

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

genus Brama (noun)	fish genus (noun)
type genus of the Bramidae	any of various genus of fish