Psenes vs fish genus

Psenes and fish genus both are nouns.

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

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

Psenes (noun)	fish genus (noun)
a genus of Stromateidae, containing driftfishes (Psenes)	any of various genus of fish