Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
riot [ˈraɪət] n (disturbance) беспоря́дки*mpl, бесчи́нства ntpl (of colours, flowers) бу́йство
vi бесчи́нствовать (impf)
to run riot бу́йствовать*(impf)
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.