Osmerus vs fish genus

Osmerus and fish genus both are nouns.

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

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

Osmerus (noun)	fish genus (noun)
type genus of the Osmeridae	any of various genus of fish