WordNet sense 1 (a heavy grey-white metallic element; the pure form is used mainly in electrical applications; it is found in several ores including wolframite and scheelite):

tungsten, wolfram

WordNet sense 2 (the cardinal compass point that is a 270 degrees):

west, westward, due west

WordNet sense 3 (a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm):

watt

WordNet sense 4 (the 23rd letter of the Roman alphabet):

double-u, letter w