WordNet sense 1 (the regions north of the Arctic Circle centered on the North Pole):

Arctic Zone, North Frigid Zone

WordNet sense 2 (a waterproof overshoe that protects shoes from water or snow):

galosh, gumshoe, rubber, golosh

WordNet sense 3 (at or near the north pole):

north-polar

WordNet sense 4 (of or existing at or near a geographical pole or within the Arctic or Antarctic Circles):

polar

WordNet sense 5 (extremely cold):

frigid, gelid, glacial, icy

WordNet sense 6 (used of physical coldness; having a low or inadequate temperature or feeling a sensation of coldness or having been made cold by e.g. ice or refrigeration):

cold