Racerunner is a term that refers to a quick-moving creature such as a lizard or a snake. When looking for synonyms for this word, there are several options available. For instance, swift and agile are two terms that can be used to describe a racerunner's speed and agility. Other options include nimble, speedy, and fleet-footed. Additionally, the term sprinter can be used to describe a racerunner who moves quickly over short distances. No matter which synonym is used, it's clear that the racerunner is an impressive creature that moves with incredible speed and grace.