Selene vs fish genus

Selene and fish genus both are nouns.

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

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

Selene: a genus of Carangidae, containing the lookdowns and moonfishes (Selene)
fish genus: any of various genus of fish

Selene (noun)	fish genus (noun)
a genus of Carangidae, containing the lookdowns and moonfishes (Selene)	any of various genus of fish
(Greek mythology) goddess of the Moon in ancient mythology; identified with Roman Luna