Fregatidae vs bird family

Fregatidae and bird family both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fregatidae	Yes	No	No	No
bird family	Yes	No	No	No

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

Fregatidae: frigate birds
bird family: a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

Fregatidae (noun)	bird family (noun)
frigate birds	a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings