The term 'They Make Waves' can be broken down into three crossword solutions: OARS (4 letters), SEAS (4 letters), and OCEANS (6 letters). OARS are used to propel a boat through the water, and are typically found on smaller vessels. Seas are large bodies of salt water that are partially enclosed by land, and are usually smaller than OCEANS. OCEANS are the largest bodies of water on Earth, and cover more than 70% of the planet's surface.