Another word for fighter
One who fights
contestant, disputant, contender, party to a quarrel, warrior, soldier, combatant, belligerent, assailant, aggressor, antagonist, rival, opponent, champion, swashbuckler, swordsman, duelist, bully, gladiator, janissary, feudist, competitor, wrestler, controversialist, quarrelsome person, fire-eater, brawler, scrapper*.
A professional pugilist
An airplane built to fight
combat plane, interceptor, pursuit plane; see plane 3.