Head race is a term typically used in the sport of rowing to describe a race against the clock, where teams race in a staggered format to determine who can complete the course the fastest. While "head race" is the traditional term used for these types of competitions, there are some alternative phrases that can be used to describe the same event. Other possible synonyms for head races include time trials, endurance races, long-distance races, and time-only events. Ultimately, it comes down to how the organizers of the event prefer to label it, but each of these terms could be used interchangeably to describe these types of races.