conflict
/ˈkɒnflɪkt/ noun [C, U]
DISAGREEMENT › serious disagreement: The Government was in conflict with the unions over pay. The peasants often came into conflict with the landowners.
FIGHTING › fighting between groups or countries: armed conflict
DIFFERENCE › when two or more different things cannot easily exist together: the conflict between science and religion
a conflict of interest › a situation where someone cannot make fair decisions because they are influenced by something