Runner is a versatile word that can be used to describe different things depending on the context. Some synonyms for the word "runner" include jogger, sprinter, racer, athlete, marathoner, track star, and courier. A jogger is someone who runs regularly and typically at a moderate pace for exercise. A sprinter is someone who runs fast over a short distance. A racer is someone who competes in races. An athlete is someone who engages in physical activities, like running, at a competitive level. A marathoner is someone who runs a marathon race, which is a long-distance event. A track star is an athlete who dominates in track and field events. A courier is someone who runs or delivers items, such as packages or messages, on foot.