Nouns

(n)duel, affaire d'honneura prearranged fight with deadly weapons by two people (accompanied by seconds) in order to settle a quarrel over a point of honor
(n)duelany struggle between two skillful opponents (individuals or groups)

Verbs

(v)duelfight a duel, as over one's honor or a woman“In the 19th century, men often dueled over small matters”