RYB is an acronym that stands for red, yellow, and blue. These three colors are known as the primary colors because they cannot be created by mixing other colors together. Instead, they are used to create all the other colors on the color wheel. However, there are other synonyms for these colors that can be used interchangeably in certain contexts. Scarlet or crimson are synonyms for red while gold or lemon can be used to replace yellow. For blue, you can use azure or cobalt. These synonyms are useful when describing color shades, especially in the fashion and design industries.