com·bat·ant /kəmˈbætṇt ||ˈkɑmbətənt/
  爭鬥者,戰鬥員
  Com·bat·ant a.  Contending; disposed to contend.
  Com·bat·ant, n.  One who engages in combat.  IN military use, opposed to noncombatant. “The mighty combatants.”
     A controversy which long survived the original combatants.   --Macaulay
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  combatant
       adj : engaging in or ready for combat
       n : someone who fights (or is fighting) [syn: battler, belligerent,
            fighter, scrapper]