Atrichornithidae vs bird family

Atrichornithidae and bird family both are nouns.

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

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

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

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