genus Argentina vs fish genus

genus Argentina and fish genus both are nouns.

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

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

genus Argentina (noun)	fish genus (noun)
type genus of the Argentinidae: argentines	any of various genus of fish