family Carapidae vs fish family

family Carapidae and fish family both are nouns.

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

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

family Carapidae (noun)	fish family (noun)
pearlfishes: related to the Brotulidae	any of various families of fish