Sagittariidae vs bird family

Sagittariidae and bird family both are nouns.

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

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

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

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