The word "rockest" has several synonyms that convey similar meanings, such as "jiggle," "vibrate," and "shake." These words indicate a movement or motion of an object or a person that is usually caused by force or energy. Another synonym for "rockest" is "sway," which suggests a gentle back-and-forth motion. Other related words include "tremble," "quiver," and "twitch," which all imply a rapid or involuntary movement. In general, these words suggest a sense of motion, energy, and vibration that can be applied to many different situations, from the movement of a boat on the water to the vibration of a person's voice during a speech.