妨害 （ボウガイ） obstruction, hindrance, blocking, disturbance, interference, interruption, sabotage, jamming (a signal)

妨害機 （ボウガイキ） jammer (e.g. radio signals), interceptor (aircraft)

公妨 （コウボウ） interference with a public servant in the execution of his or her duties

転び公妨 （コロビコウボウ） falsely provoked arrest for obstruction, police pretending to be knocked down so as to have grounds for an arrest

妨げる （さまたげる） to disturb, to prevent, to obstruct, to hinder