This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A person who fights a duel.

n. One who fights in single combat.

n. One who fights in single combat; one who practises or promotes the practice of dueling.

n. a person who fights duels

"A sampling -- including my most favorite, on that "duelist" religion founded by (ironically enough!)"

resister    opponent    antagonist    opposer    adversary   

duellist   

dueler   

dualist    individualist   

unrelentingwill    boozer    litah    swashbuckler    bear-hunter    self-assuredness    hail-fellow    dogtrot    poulterer    self-judgment