white fox vs Arctic fox

white fox and Arctic fox both are nouns.

Word	Noun	Adjective	Verb	Adverb
white fox	Yes	No	No	No
Arctic fox	Yes	No	No	No

As nouns, white fox and Arctic fox are synonyms defined as:

white fox and Arctic fox: thickly-furred fox of Arctic regions; brownish in summer and white in winter

Other synonyms of white fox include Alopex lagopus.

white fox (noun)	Arctic fox (noun)
thickly-furred fox of Arctic regions; brownish in summer and white in winter	thickly-furred fox of Arctic regions; brownish in summer and white in winter