Scratch is to gash as ripple is to blank?

Scratch and gash both refer to types of skin injuries, with gash indicating a deeper and more severe wound. Similarly, ripple and wave both describe movements on the surface of water, with wave implying a larger and more noticeable disturbance. Therefore, the Word that completes the analogy is "wave," as it is the more intense version of ripple, just as gash is the more severe version of scratch.