disturber
  打擾者
  Dis·turb·er n.
  1. One who, or that which, disturbs of disquiets; a violator of peace; a troubler.
     A needless disturber of the peace of God's church and an author of dissension.   --Hooker.
  2. Law One who interrupts or incommodes another in the peaceable enjoyment of his right.
  ◄ ►
  disturber
       n : a troubler who disquiets or interferes with peace and quiet;
           someone who causes disorder and commotion