A "master plan" refers to a comprehensive strategy or blueprint for achieving a goal. While this term is commonly used to describe a detailed plan of action, there are various synonyms that can be used to describe the same concept. These include terms like "game plan," "scheme," "roadmap," "blueprint," "strategy," "design," "outline," "program," and "agenda." Each of these synonyms can be used to describe a plan that outlines the steps that need to be taken in order to achieve a desired outcome. Whether you're talking about developing a business plan or creating a strategy for achieving a personal goal, the key is to have a well-defined and comprehensive plan in place.