妨害 （ボウガイ） disturbance, obstruction, hindrance, jamming, interference

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