WordNet sense 1 (a disorderly outburst or tumult):

commotion, disturbance, flutter, to-do, hoo-ha, hoo-hah, kerfuffle

WordNet sense 2 (an event that results in a displacement or discontinuity):

dislocation

WordNet sense 3 (the act of causing disorder):

perturbation

WordNet sense 4 (an act of delaying or interrupting the continuity):

break, gap, interruption