conflict
con-flict
noun
A serious disagreement, argument, or struggle, often prolonged or violent.
"The two nations were in armed conflict."
verb
To be incompatible or at variance; to clash or disagree with something.
"His statements conflict with the evidence."
Thesaurus
Synonyms: difference of opinion, difference, dispute, contravene, run afoul, infringe, fight, engagement, battle, struggle