Coregonidae vs fish family

Coregonidae and fish family both are nouns.

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

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

Coregonidae: soft-finned fishes comprising the freshwater whitefishes; formerly included in the family Salmonidae
fish family: any of various families of fish

Coregonidae (noun)	fish family (noun)
soft-finned fishes comprising the freshwater whitefishes; formerly included in the family Salmonidae	any of various families of fish