duelist

noun duelist

• warrior — a person engaged or experienced in warfare; soldier.
• champion — A champion is someone who has won the first prize in a competition, contest, or fight.
• mercenary — working or acting merely for money or other reward; venal.
• assailant — Someone's assailant is a person who has physically attacked them.
• militant — vigorously active and aggressive, especially in support of a cause: militant reformers.