Aepyornidae vs bird family

Aepyornidae and bird family both are nouns.

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

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

Aepyornidae: coextensive with the order Aepyorniformes
bird family: a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

Aepyornidae (noun)	bird family (noun)
coextensive with the order Aepyorniformes	a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings