(n.) One who squabbles; a contentious person; a brawler.

acrid aggressive antagonist antagonistic antipathetic ardent argumental argumentative attacking battler battling bellicose belted knight bickerer bickering bitter blade bloodthirsty bloody bloody-minded bravo brawler bully bullyboy cat-and-dog cat-and-doggish caustic chauvinist chauvinistic clashing colliding combatant combative competitor conflicting contender contentious contestant controversial despiteful disputant disputatious divisive duelist enemy enforcer eristic factional factious fencer ferocious feuder fierce fighter fighting fighting cock foilsman full of fight full of hate gamecock gladiator goon gorilla hatchet man hateful hawk hawkish hood hoodlum hooligan hostile hot inimical invading irascible irritable jingo jingoish jingoist jingoistic jouster knight litigious malevolent malicious malignant martial militant militaristic military offensive partisan plug-ugly polarizing polemic pugnacious quarreler quarrelsome rancorous repugnant rioter rival rough rowdy ruffian saber-rattling sabreur sanguinary sanguineous savage scrapper scrappy scuffler set against shrewish soldierlike soldierly sore spiteful squabbler strong arm strong-arm man strong-armer struggler swashbuckler sword swordplayer swordsman tempered thug tilter tough trigger-happy truculent tussler unfriendly unpacific unpeaceable unpeaceful venomous virulent vitriolic warlike warmonger warmongering warring wrangler wrangling