Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
dealer [ˈdiːlər] n (COMM) торго́вец#; (also: art dealer) ди́лер; (CARDS) сдаю́щий[-ая] m(f) adj ка́рты, банкомёт
drug dealer наркоделе́ц
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.