white tail vs white-tailed deer

white tail and white-tailed deer both are nouns.

Word	Noun	Adjective	Verb	Adverb
white tail	Yes	No	No	No
white-tailed deer	Yes	No	No	No

As nouns, white tail and white-tailed deer are synonyms defined as:

white tail and white-tailed deer: common North American deer; tail has a white underside

Other synonyms of white tail include Odocoileus Virginianus, Virginia deer, whitetail, whitetail deer.

white tail (noun)	white-tailed deer (noun)
common North American deer; tail has a white underside	common North American deer; tail has a white underside