genus Chaenopsis vs fish genus

genus Chaenopsis and fish genus both are nouns.

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

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

genus Chaenopsis: a genus of fish of the family Clinidae including pikeblennies
fish genus: any of various genus of fish

genus Chaenopsis (noun)	fish genus (noun)
a genus of fish of the family Clinidae including pikeblennies	any of various genus of fish