There are several synonyms for the word "whippest" that are commonly used in everyday language. Some of these words include "fastest," "quickest," "speediest," and "most rapid." These words all convey a sense of speed and movement, and can be used to describe a variety of activities, such as running, driving, or even thinking. Other possible synonyms might include "nimblest," "fleetest," or "most agile," which suggest a combination of speed and agility or dexterity. Ultimately, the choice of synonym will depend on the context and intended meaning, but all of these words can add color and clarity to any piece of writing.