genus Lumpenus vs fish genus

genus Lumpenus and fish genus both are nouns.

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

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

genus Lumpenus (noun)	fish genus (noun)
a genus of Stichaeidae	any of various genus of fish