Catostomidae vs fish family

Catostomidae and fish family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Catostomidae	Yes	No	No	No
fish family	Yes	No	No	No

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

Catostomidae (noun)	fish family (noun)
suckers; closely related to the family Cyprinidae	any of various families of fish