DISTURBER
disturber
(noun) a troubler who interrupts or interferes with peace and quiet; someone who causes disorder and commotion
Source: WordNet® 3.1
Etymology
Noun
disturber (plural disturbers)
Someone or something that disturbs; a disrupter.
Source: Wiktionary
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)
Definition: One who interrupts or incommodes another in the peaceable
enjoyment of his right.
Source: Webster’s Unabridged Dictionary 1913 Edition