soccer or football!

The term soccer comes from Association Football, and it was invented by the American not to make a confusion between Association Football and American Football. Worldwide the sport you're referring to is called football, because there is no reason to be called otherwise. Only a few countries have other types of football: Canadian Football, American Football, Australian Football, Gaelic Football. Rugby football is simply called rugby so there's no confusion with football. Call it football, because it's the right name for it!