family Scaridae vs fish family

family Scaridae and fish family both are nouns.

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

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

family Scaridae (noun)	fish family (noun)
parrotfishes	any of various families of fish