whitetail vs white tail

whitetail and white tail both are nouns.

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

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

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

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

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