Search Result for "fighter": 
Wordnet 3.0

NOUN (3)

1. someone who fights (or is fighting);
[syn: combatant, battler, belligerent, fighter, scrapper]

2. a high-speed military or naval airplane designed to destroy enemy aircraft in the air;
[syn: fighter, fighter aircraft, attack aircraft]

3. someone who fights for a cause;
[syn: champion, fighter, hero, paladin]

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3 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

Fighter \Fight"er\ (f[imac]t"[~e]r), n. [AS. feohtere.] 1. One who fights; a combatant; a warrior. --Shak. [1913 Webster] 2. A boxer; a pugilist. [PJC] 3. A person with the determination and will to persist through great difficulty to achieve a goal; one with the courage to fight and resist an opponent, and to struggle with all one's powers. [PJC] 4. (Mil.) A military aircraft designed to seek out and destroy enemy aircraft; it is usually smaller and more maneuvarable than aircraft designed specifically for bombing. However, hybrid fighter-bomber aircraft that perform both functions also are used. [PJC]
WordNet (r) 3.0 (2006):

fighter n 1: someone who fights (or is fighting) [syn: combatant, battler, belligerent, fighter, scrapper] 2: a high-speed military or naval airplane designed to destroy enemy aircraft in the air [syn: fighter, fighter aircraft, attack aircraft] 3: someone who fights for a cause [syn: champion, fighter, hero, paladin]
Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "fighter": Chinese boxer, bantamweight, battler, belligerent, belted knight, bickerer, black belt, blade, boxer, bravo, brawler, brown belt, bruiser, bully, bullyboy, combatant, competitor, contender, contestant, disputant, duelist, enforcer, featherweight, fencer, feuder, fighting cock, fighting man, fisticuffer, flyweight, foilsman, gamecock, gladiator, goon, gorilla, hatchet man, heavyweight, hood, hoodlum, hooligan, jouster, karate expert, knight, light heavyweight, lightweight, man-at-arms, middleweight, militant, palooka, plug-ugly, prizefighter, pug, pugilist, quarreler, rioter, rival, rough, rowdy, ruffian, sabreur, savate expert, scrapper, scuffler, serviceman, sparrer, squabbler, strong arm, strong-arm man, strong-armer, struggler, swaddy, swashbuckler, sweat, sword, swordplayer, swordsman, thug, tilter, tough, tussler, warrior, welterweight, wrangler