Merginae vs bird family

Merginae and bird family both are nouns.

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

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

Merginae: mergansers and closely related diving birds
bird family: a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

Merginae (noun)	bird family (noun)
mergansers and closely related diving birds	a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings