Sittidae vs bird family

Sittidae and bird family both are nouns.

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

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

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

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