The term 'They Can Make Waves' can be broken down into two crossword solutions: SINES (5 letters) and OARS (4 letters). SINES are mathematical functions that describe the shape of a wave, and are used to model many natural phenomena such as sound and light. OARS are long poles with blades at one end that are used to propel a boat through water. Both SINES and OARS are capable of creating waves in their respective mediums.