family Ursidae vs mammal family

family Ursidae and mammal family both are nouns.

Word	Noun	Adjective	Verb	Adverb
family Ursidae	Yes	No	No	No
mammal family	Yes	No	No	No

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

family Ursidae (noun)	mammal family (noun)
bears and extinct related forms	a family of mammals