genus Anguilla vs fish genus

genus Anguilla and fish genus both are nouns.

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

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

genus Anguilla (noun)	fish genus (noun)
type genus of the Anguillidae: eels	any of various genus of fish