The word ripple is often used to describe a small wave or disturbance on the surface of water. However, there are many synonyms that can be used to describe this same effect. For example, you could use the word undulation, which means a smooth wave-like motion. Alternatively, you could use the word wavelet, which is a small wave or ripple. Other synonyms for ripple include tremble, quiver, oscillation, and vibration. Whether you are describing the movement of water or the subtle effects of an action, there are many words you can use instead of ripple to add variety and nuance to your writing.