family Anatidae vs bird family

family Anatidae and bird family both are nouns.

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

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

family Anatidae: swimming birds having heavy short-legged bodies and bills with a horny tip: swans, geese, ducks
bird family: a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

family Anatidae (noun)	bird family (noun)
swimming birds having heavy short-legged bodies and bills with a horny tip: swans, geese, ducks	a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings