family Pittidae vs bird family

family Pittidae and bird family both are nouns.

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

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

family Pittidae: pittas
bird family: a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

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