There are a few synonyms for the phrase "cooper-saeed waves," which refers to a specific type of ocean wave that occurs in a particular range of frequencies and heights. Some options might include "oceanic swells," "rolling breakers," or "cresting surges." Each of these terms suggests a similar sense of power and movement, as well as an organic ebb and flow that is characteristic of waves in general. Whether you're describing the crashing surf at the beach or the undulating motion of the ocean itself, these synonyms can be useful tools for capturing the spirit and essence of one of the most awe-inspiring natural phenomena on the planet.