Anguillidae vs fish family

Anguillidae and fish family both are nouns.

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

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

Anguillidae: eels that live in fresh water as adults but return to the sea to spawn
fish family: any of various families of fish

Anguillidae (noun)	fish family (noun)
eels that live in fresh water as adults but return to the sea to spawn	any of various families of fish