[kamaal]

Winner and Loser have personal traits attached to them. Loser almost implies that the individual had some problems personally and not in the way he executed the task.

Success and Failure imply that the individual did task X, Y , Z to achieve a result S or not achieve result S. It has more to do with an individuals execution at the instance.

Loser almost implies that the person is doomed and some how naturally incapable.