1) Aaron Burr 2) Aaron Burr, famously 3) Adversary 4) Antagonist 5) Competitor with a sword 6) Dueler 7) Dueller 8) Duellist 9) Hamilton or Burr, infamously 10) One who has a second helping 11) Opponent 12) Opposer 13) Resister 14) Shootout participant 1) Combatant 2) Dueler 3) Dueller 4) Duellist 5) Fencer 
• (n.) One who fights in single combat.
Du'el·ist noun [ French duelliste .] One who fights in single combat. [ Written also duellist .] « A duelist . . . always values himself upon his courage, his sense of honor, his fidelity and friendship.» Hume. 
a person who participates in a duel.