WordNet sense 1 (an event in which one thing is substituted for another):

permutation, replacement, substitution, transposition

WordNet sense 2 (control consisting of a mechanical or electrical or electronic device for making or breaking or changing the connections in a circuit):

electric switch, electrical switch

WordNet sense 3 (exchange or give (something) in exchange for):

swap, swop, trade

WordNet sense 4 (cause to go on or to be engaged or set in operation):

flip, throw

WordNet sense 5 (lay aside, abandon, or leave for another):

change, shift

WordNet sense 6 (the act of changing one thing or position for another):

switching

WordNet sense 7 (change over, change around, as to a new order or sequence):

exchange, switch over

WordNet sense 8 (reverse (a direction, attitude, or course of action)):

alternate, flip-flop, interchange, tack, alternate