a boxer; pugilist.

Military . an aircraft designed to seek out and destroy enemy aircraft in the air and to protect bomber aircraft.

a person who fights, struggles, resists, etc.

a person with the will, courage, determination, ability, or disposition to fight, struggle, resist, etc.

an animal, as a dog, trained to fight or having the disposition to fight.

noun

peacemaker

noun

aggressor , antagonist , assailant , battler , belligerent , boxer , brawler , bruiser , bully , champion , combatant , competitor , contender , contestant , disputant , duelist , gi , gladiator , heavy * , jouster , mercenary , militant , opponent , person-at-arms , pugilist , punching bag * , rival , scrapper , serviceperson , slugger , soldier , tanker , warrior , wildcat * , pug , vindicator