A preliminary layout is an initial design or plan that serves as a starting point for creating a more detailed and final version. Synonyms for preliminary layout include rough draft, preliminary design, first draft, preliminary plan, initial layout, and early sketch. These terms describe a preliminary representation of concepts or ideas, often used to communicate a vision or proposal to others. The word "preliminary" in each of these synonyms suggests a work in progress, highlighting the need for revisions and improvements as further details emerge. While each term may have a slightly different connotation, they are all used to describe a preliminary layout that is intended to be refined and revised over time.