single combat(n = noun.act) - a fight between two people; "in all armies there were officers who needed to prove their bravery by single combat"
is a kind of combat, fight, fighting, scrap

N  contention, strife, contest, contestation, struggle, belligerency, opposition, controversy, polemics, debate, war of words, logomachy, litigation, paper war, high words, sparring, competition, rivalry, corrivalry, corrivalship, agonism, concours, match, race, horse racing, heat, steeple chase, handicap, regatta, field day, sham fight, Derby day, turf, sporting, bullfight, tauromachy, gymkhana, boat race, torpids, wrestling, greco-roman wrestling, pugilism, boxing, fisticuffs, the manly art of self-defense, spar, mill, set-to, round, bout, event, prize fighting, quarterstaff, single stick, gladiatorship, gymnastics, jiujitsu, jujutsu, kooshti, sumo, athletics, athletic sports, games of skill, shindy, fracas, clash of arms, tussle, scuffle, broil, fray, affray, affrayment, velitation, colluctation, luctation, brabble, brigue, scramble, melee, scrimmage, stramash, bushfighting, free fight, stand up fight, hand to hand, running fight, conflict, skirmish, rencounter, encounter, rencontre, collision, affair, brush, fight, battle, battle royal, combat, action, engagement, joust, tournament, tilt, tilting, tournay, list, pitched battle, death struggle, struggle for life or death, life or death struggle, Armageddon, hard knocks, sharp contest, tug of war, naval engagement, naumachia, sea fight, duel, duello, single combat, monomachy, satisfaction, passage d'armes, passage of arms, affair of honor, triangular duel, hostile meeting, digladiation, deeds of arms, feats of arms, appeal to arms, pugnacity, combativeness, bone of contention, contending, together by the ears, at loggerheads, at war, at issue, competitive, rival, belligerent, contentious, combative, bellicose, unpeaceful, warlike, quarrelsome, pugnacious, pugilistic, gladiatorial, palestric, palestrical, a verbis ad verbera, a word and a blow, a very pretty quarrel as it stands, commune periculum concordiam parit, lis litem generat.

air combat command, armed combat, armored combat vehicle, armoured combat vehicle, combat, combat area, combat boot, combat casualty, combat ceiling, combat fatigue, combat injury, combat intelligence, combat mission, combat neurosis, combat pay, combat pilot, combat ship, combat zone, hors de combat, line single, line-drive single, salafast group for call and combat, single, single bed, single cream, single crochet, single dwelling, single entry, single file, single handed, single minded, single out, single prop, single quote, single shell, single stitch, single supplement, single tax