Lutjanidae vs fish family

Lutjanidae and fish family both are nouns.

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

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

Lutjanidae (noun)	fish family (noun)
the family of snappers (Lutjanidae)	any of various families of fish