confrontation

(n) a bold challenge
(n) discord resulting from a clash of ideas or opinions
(n) a hostile disagreement face-to-face face-off, showdown, encounter,
(n) the act of hostile groups opposing each other
- the government was not ready for a confrontation with the unions
- the invaders encountered stiff opposition
opposition,
(n) a focussed comparison; bringing together for a careful comparison

face-off showdown encounter opposition

confrontational