Psettichthys vs fish genus

Psettichthys and fish genus both are nouns.

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

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

Psettichthys: a genus of Soleidae, containing the Pacific sand sole (Psettichthys)
fish genus: any of various genus of fish

Psettichthys (noun)	fish genus (noun)
a genus of Soleidae, containing the Pacific sand sole (Psettichthys)	any of various genus of fish