Epinephelus vs fish genus

Epinephelus and fish genus both are nouns.

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

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

Epinephelus (noun)	fish genus (noun)
genus of groupers or sea bass	any of various genus of fish