Regular wave motion refers to the consistent and repeated movement of waves in a particular pattern. There are several synonyms that can be used to describe regular wave motion, such as regular oscillation, periodic motion, or harmonic movement. These terms all refer to the same idea of waves following a set pattern and moving in a predictable manner. Another term that can be used is sinusoidal motion, which describes a wave with a smooth, curving shape. When describing wave motion, it's important to use clear and precise language to convey the specific characteristics of the waves and their behavior.