white tail vs whitetail deer

white tail and whitetail deer both are nouns.

Word	Noun	Adjective	Verb	Adverb
white tail	Yes	No	No	No
whitetail deer	Yes	No	No	No

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

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

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

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