Nouns

(n)conflict, struggle, battlean open clash between two opposing groups (or individuals)“the harder the conflict, the more glorious the triumph” (Thomas Paine), “police tried to control the battle between the pro- and anti-abortion mobs”
(n)conflictopposition between two simultaneous but incompatible feelings“he was immobilized by conflict and indecision”
(n)battle, conflict, fight, engagementa hostile meeting of opposing military forces in the course of a war“Grant won a decisive victory in the battle of Chattanooga”, “he lost his romantic ideas about war when he got into a real engagement”
(n)conflicta state of opposition between persons or ideas or interests“his conflict of interest made him ineligible for the post”, “a conflict of loyalties”
(n)conflictan incompatibility of dates or events“he noticed a conflict in the dates of the two meetings”
(n)conflictopposition in a work of drama or fiction between characters or forces (especially an opposition that motivates the development of the plot)“this form of conflict is essential to Mann's writing”
(n)dispute, difference, difference of opinion, conflicta disagreement or argument about something important“he had a dispute with his wife”, “there were irreconcilable differences”, “the familiar conflict between Republicans and Democrats”

Verbs

(v)conflictbe in conflict“The two proposals conflict!”
(v)conflict, run afoul, infringe, contravenego against, as of rules and laws“He ran afoul of the law”, “This behavior conflicts with our rules”