family Gerreidae vs fish family

family Gerreidae and fish family both are nouns.

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

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

family Gerreidae (noun)	fish family (noun)
mojarras	any of various families of fish