Mulloidichthys vs fish genus

Mulloidichthys and fish genus both are nouns.

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

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

Mulloidichthys (noun)	fish genus (noun)
a genus of Mullidae	any of various genus of fish