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rioter (n.)

late 14c., riotour, "debauchee, one who leads a dissolute life, roisterer," from Old French riotour, from riote "dispute, quarrel, domestic strife" (see riot (n.)). The ending was altered late 16c. to conform to -er (1). Meaning "one who takes part in a rising or public disturbance against authority" is from mid-15c. (from late 14c. in Anglo-French).

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Definitions of rioter from WordNet

rioter (n.)
troublemaker who participates in a violent disturbance of the peace; someone who rises up against the constituted authority;
From wordnet.princeton.edu