(n.) One who contests; an opponent; a litigant; a disputant; one who claims that which has been awarded to another.

adversary battler belligerent belted knight bickerer blade bravo brawler bully bullyboy carouser combatant competitor contender corrival cutup disputant duelist emulator enforcer entrant fencer feuder fighter fighting cock foilsman frisker frolicker funmaker gamboler gamecock gladiator goon gorilla hatchet man hood hoodlum hooligan jouster knight merrymaker militant opponent participant playboy player pleasure-seeker pleasurer pleasurist plug-ugly quarreler reveler rioter rival rollicker rough rowdy ruffian sabreur scrapper scuffler skylarker squabbler strong arm strong-arm man strong-armer struggler swashbuckler sword swordplayer swordsman the field thug tilter tough tussler vier wrangler