family Alcidae vs Alcidae

family Alcidae and Alcidae both are nouns.

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

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

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

family Alcidae (noun)	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.