Holocentrus vs fish genus

Holocentrus and fish genus both are nouns.

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

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

Holocentrus (noun)	fish genus (noun)
type genus of the family Holocentridae; squirrelfishes	any of various genus of fish