dispute

[1]	argue with/against , question , debate , challenge , impugn , gainsay , deny , oppose , fight (against) , object to , take exception to , disagree with , contest , confute , quarrel with , doubt , raise doubts about , dissent (from)
[2]	argue (about) , debate , discuss , quarrel about , wrangle over , differ (on/about)
[3]	challenge , gainsay
[4]	quarrel , scrap , argufy , altercate

[1]	difference , difference of opinion , conflict
[2]	contravention
[3]	argument , debate , disagreement , difference (of opinion) , controversy , polemic , conflict , quarrel , wrangle , velitation , discussion , (Colloq) (Brit) argy-bargy/argie-bargie/argle-bargle
[4]	conflict , disturbance , fight , altercation , row , disagreement , brawl , Donnybrook , feud , rumpus , fracas , strife , discord , tiff , velitation , (US) spat