Chromatic spectrums refer to the various colors and their gradations that can be seen by the human eye. Synonyms for this term include the color spectrum, the rainbow, the visible spectrum, and the color wheel. Each of these synonyms embodies the idea of the vast range of colors that exist in the world and how they can be arranged and ordered. The color spectrum and the visible spectrum both emphasize the idea that these colors are able to be seen by the human eye, while the rainbow brings in the natural phenomenon that can be often seen after a rainstorm. The color wheel is a commonly used tool to illustrate the relationships between different colors, which can be helpful in design or artistic applications.