Conflict

con·flict

[v. kuhn-flikt; n. kon-flikt] Show IPA verb (used without object)

1. to come into collision or disagreement; be contradictory, at variance, or in opposition; clash: The account of one eyewitness conflicted with that of the other. My class conflicts with my going to the concert.

2.
to fight or contend; do battle.
noun
3.
a fight, battle, or struggle, especially a prolonged struggle; strife.
4.
controversy; quarrel: conflicts between parties.
5.
discord of action, feeling, or effect; antagonism or opposition, as of interests or principles: a conflict of ideas.
6.
a striking together; collision.
7.
incompatibility or interference, as of one idea, desire, event, or activity with another: a conflict in the schedule.