Virginia deer vs deer

Virginia deer and deer both are nouns.

Word	Noun	Adjective	Verb	Adverb
Virginia deer	Yes	No	No	No
deer	Yes	No	No	No

As nouns, deer is a hypernym of Virginia deer; that is, deer is a word with a broader meaning than Virginia deer:

Virginia deer: common North American deer; tail has a white underside
deer: distinguished from Bovidae by the male's having solid deciduous antlers

Other hypernyms of Virginia deer include cervid.

Virginia deer (noun)	deer (noun)
common North American deer; tail has a white underside	distinguished from Bovidae by the male's having solid deciduous antlers