Muraenidae vs fish family

Muraenidae and fish family both are nouns.

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

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

Muraenidae (noun)	fish family (noun)
a family of moray eels (Muraenidae)	any of various families of fish