He hunts and fishes 'for sport'. [=he hunts and fishes because he enjoys it and not as a job or because he needs food for survival]
My brother likes 'sports'. [=he enjoys playing and/or watching games such as football, baseball, basketball, golf, etc.]
He lost but he was a 'good sport' about it. [=he was not rude or angry about losing]
(..) I don't know what he's so upset about. There's only bucks in here. Probably the watch. Who's that? Another stiff can barely climb out of his sports car. - No, that's Bruce Wayne! - Mr. Wayne, over here! - I'm not sure if my assistant... - Right through here, Mr. Wayne. Thank you so much. (..)2012 The Dark Knight Rises