family Ariidae vs fish family

family Ariidae and fish family both are nouns.

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

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

family Ariidae (noun)	fish family (noun)
sea catfishes	any of various families of fish