family Gadidae vs fish family

family Gadidae and fish family both are nouns.

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

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

family Gadidae (noun)	fish family (noun)
large family of important mostly marine food fishes	any of various families of fish