Alcidae vs bird family

Alcidae and bird family both are nouns.

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

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

Alcidae: web-footed diving seabirds of northern seas: auks, puffins, guillemots, murres, etc.
bird family: a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings

Alcidae (noun)	bird family (noun)
web-footed diving seabirds of northern seas: auks, puffins, guillemots, murres, etc.	a family of warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings