Gesso is a word that is commonly used in the world of art and refers to a material that is used to prime surfaces before painting. However, there are many synonyms that can be used for the word gesso. Some of the most commonly used synonyms include primer, undercoat, base coat, ground, and preparation. These words all refer to the same basic concept of preparing a surface for a painting by applying a coating that will help the paint adhere better and create a smoother, more even finish. So, if you're an artist looking for alternatives to the word gesso, there are plenty of options available to you!