Steatornithidae vs bird family

Steatornithidae and bird family both are nouns.

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

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

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

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