Roger Woodham replies:'sport' or 'game'

Sports are activities which require physical effort and ability and some degree of mental skill usually. They are often organised competitively, played outdoors and with a ball, although not necessarily. Thus:

rugby
cricket
football
basketball
hockey
baseball
netball
tennis
table tennis
squash
badminton
volleyball
golf
motor racing
cycling
skiing
running
swimming

However, we talk about games when two teams or individuals meet to play against each other. (So, for this reason, they are called the Olympic Games.) Compare the following:

Games are also activities involving skill, knowledge or chance in which you try to win against an opponent or solve puzzles. Thus, we have 'word games', 'card games', 'computer games' and games like chess, backgammon, dominoes, darts, snooker, mahjong and Monopoly. For games like these, not so much, if any, physical ability or skill is needed.