bird family vs subphylum Vertebrata

bird family and subphylum Vertebrata both are nouns.

Word	Noun	Adjective	Verb	Adverb
bird family	Yes	No	No	No
subphylum Vertebrata	Yes	No	No	No

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