Salmonidae vs fish family

Salmonidae and fish family both are nouns.

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

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

Salmonidae (noun)	fish family (noun)
salmon and trout	any of various families of fish