noun
a person who takes part in a riot; a person who engages in violent or unlawful behavior in a group setting
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The police were able to identify and arrest the rioter responsible for inciting violence.
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Did you hear about the rioter who got caught looting during the protest?
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That rioter is always causing trouble wherever they go.
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In the chaos of the situation, the rioter symbolized the breakdown of law and order.