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Synonyms for W (same or very similar meaning)

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):

WordNet sense 4 (the 23rd letter of the Roman alphabet):
double-u, letter w

From the ODE community, based on WordNetadd/edit