debater

a person who takes part in a dispute the debater was unable to come up with a convincing rebuttal for his opponent's argument Synonyms arguer, argufier, bickerer, brawler, disputant, disputer, fighter, quarreler (or quarreller), scrapper, squabbler, wranglerRelated Words advocate, codefendant, defendant, plaintiff, pleader; challenger, contender, contestant, skirmisher; fusser, nitpicker, pettifogger, quibbler