The word "pacy" is often used to describe something that is fast or quick, such as a story or a sports game. However, there are many synonyms for this word that can be used to convey the same meaning. Some of these synonyms include speedy, rapid, swift, brisk, hasty, expeditious, fleet-footed, zippy, and accelerated. Each of these words has a slightly different connotation, and choosing the right one will depend on the context in which it is being used. For example, "swift" may be more appropriate if you are describing someone running a sprint, while "expeditious" may be better suited for describing a process or task that needs to be completed quickly.