[1] : The Collaborative International Dictionary of English v.0.48

peacemaker \peace"mak`er\, n.
   one who makes peace by reconciling parties that are at
   variance. --matt. v. 9.
   1913 webster --peace"mak`ing, n.
   1913 webster
see also:
peace"mak`ing 

[2] : WordNet (r) 2.0

peacemaker
     n 1: someone who tries to bring peace syn: conciliator, make-peace,
           pacifier, reconciler
     2: a belt-fed machine gun capable of firing more than 500
        rounds per minute; used by united states troops in world
        war ii and the korean war syn: browning machine gun
see also:
conciliator make-peace pacifier reconciler browning machine gun 

[3] : Moby Thesaurus II by Grady Ward, 1.0

55 moby thesaurus words for "peacemaker":
   adjudicator, alleviative, alleviator, anodyne, appeaser,
   arbitrator, assuager, balm, calmative, conchie, conciliator,
   conscientious objector, cushion, diplomat, dolorifuge, dove,
   family counselor, go-between, interceder, intermediary,
   intermediator, lenitive, make-peace, marriage counselor, mediator,
   mitigator, moderator, modulator, mollifier, negotiator,
   pacificator, pacificist, pacifier, pacifist, palliative,
   peace lover, peacekeeper, peacemonger, peacenik, placater,
   propitiator, reconciler, referee, restraining hand, salve,
   sedative, shock absorber, smoother-over, soother, soothing syrup,
   stabilizer, temperer, tranquilizer, umpire, wiser head

Peacemaker >> P Words
Peacemaker, definition of term: Peacemaker
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