* Undulate: To move in waves or with a wavelike motion.
* Undulation: A wavelike motion or form.
* Inundate: To overwhelm with a flood of something, like water or information.
* Abundant: Existing in large quantities. This word comes from the Latin "abundare", which means "to overflow".
While not directly derived from "unda", words like "wave" and "ocean" share a similar semantic connection to the concept of water and waves.