A lipogram is a written work that excludes certain letters or groups of letters from its text. This literary technique is used to challenge the writer's creativity and imagination. There are several synonyms for the word "lipogram" that can be used to describe this type of writing, including constrained writing, letter constraint, and alphabet avoidance. Other similar terms include word games, letter games, and linguistic puzzles. Regardless of what it is called, a lipogram can be an entertaining and engaging way to test your writing skills and push your abilities to the limit.