The Collaborative International Dictionary of English v.0.48:
Controversialist \Con`tro*ver"sial*ist\, n. One who carries on a controversy; a disputant. [1913 Webster] He [Johnson] was both intellectually and morally of the stuff of which controversialists are made. --Macaulay. [1913 Webster]WordNet (r) 3.0 (2006):
controversialist n 1: a person who disputes; who is good at or enjoys controversy [syn: disputant, controversialist, eristic]