Wavelength is a term used to describe the distance between two consecutive peaks or troughs in a wave. However, it has a few synonyms that can also be used to refer to the same concept. One synonym is frequency, which refers to the number of waves that pass by a given point in a specific amount of time. Another synonym is period, which is the time it takes for one full wavelength to pass by a given point. Another term that can be used interchangeably with wavelength is wave length, although it is often written as a single word. Regardless of which synonym is used, they all refer to the same underlying physics concept.