greyhound racing(n = noun.act) - the sport of racing greyhounds;
is a kind of racing
auto racing, boat racing, camel racing, car racing, dog racing, greyhound, harness racing, horse racing, hydroplane racing, italian greyhound, racing, racing boat, racing car, racing circuit, racing gig, racing shell, racing skate, racing skiff, racing start, racing yacht, thoroughbred racing