disturber
Dis*turb"er, n. Etym: [Cf. OF. destorbeor.] 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) Defn: One who interrupts or incommodes another in the peaceable enjoyment of his right.