Lumpenus vs fish genus

Lumpenus and fish genus both are nouns.

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

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

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