Alcidae vs family Alcidae

Alcidae and family Alcidae both are nouns.

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

As nouns, Alcidae and family Alcidae are synonyms defined as:

Alcidae and family Alcidae: web-footed diving seabirds of northern seas: auks, puffins, guillemots, murres, etc.

Alcidae (noun)	family Alcidae (noun)
web-footed diving seabirds of northern seas: auks, puffins, guillemots, murres, etc.	web-footed diving seabirds of northern seas: auks, puffins, guillemots, murres, etc.