family Zoarcidae vs fish family

family Zoarcidae and fish family both are nouns.

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

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

family Zoarcidae (noun)	fish family (noun)
eelpouts	any of various families of fish