Cases of word usage

1) a horse-drawn vehicle with two wheels, used in ancient times in fighting and racing (chariot)

2) the hobby, sport, profession of racing horses, cars etc (racing)

3) one after another; (of water) flowing; done, made, carried on, while or immediately after running; the act of a person or animal that runs, especially in racing (running)

4) the soil with grass growing in it; (the-) horse racing as a sport (turf)