Sterninae vs bird family

Sterninae and bird family both are nouns.

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

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

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

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