Collocations for riot - noun

major, serious
full-scale
bloody, violent
deadly (esp. AmE)
inner-city (esp. BrE), street, urban
prison
race
political, religious
anti-American, anti-war, etc.
student
bread, food
Shortages eventually led to food riots.

draft (esp. AmE)
the violent draft riots during the Civil War

laugh (AmE)
The movie is a laugh riot.

cause, incite, instigate, provoke, spark (esp. BrE), start, trigger
The city's housing and unemployment problems provoked serious riots.

put down, quell, stop
have
The city had the worst race riot in history.

begin, break out, erupt, happen, occur, start
Prison riots broke out over worsening conditions.

ensue, follow

cop (esp. AmE), police, squad
gear, gun (esp. AmE), helmet (esp. AmE), shield
control

during a/the riot, in a/the riot
He was killed in the riots.

riot against, riot over
a riot against bread prices

run riot
Local youths ran riot after the attack.