WordNet sense 1 ((of a government or government official) holding an office means being in power):

office

WordNet sense 2 (one possessing or exercising power or influence or authority):

force

WordNet sense 3 (a very wealthy or powerful businessman):

baron, king, magnate, mogul, tycoon, big businessman, business leader, top executive

WordNet sense 4 (a state powerful enough to influence events throughout the world):

superpower, world power, great power, major power

WordNet sense 5 (a mathematical notation indicating the number of times a quantity is multiplied by itself):

exponent, index

WordNet sense 6 (possession of the qualities (especially mental qualities) required to do something or get something done):

ability

WordNet sense 7 (possession of controlling influence):

powerfulness

WordNet sense 8 (physical strength):

might, mightiness