There are several synonyms for the term "horse races". One of the most common synonyms is "racetrack", which refers to the location where horse races take place. Another synonym is "horse racing", which is the overall sport of competing horses and riders. "Steeplechase" is another synonym that refers to a specific type of horse race where horses and riders must jump over obstacles. "Derby" is yet another synonym that is often used to refer to a specific type of horse race, such as the Kentucky Derby. Other synonyms for horse races include "thoroughbred racing", "flat racing", and "harness racing".