bird family vs Craniata

bird family and Craniata both are nouns.

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

bird family (noun)	Craniata (noun)
a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings	fishes, amphibians, reptiles, birds, mammals