When two or more things are compatible and create a cohesive unit, they are said to fit together. However, there are many synonyms for the phrase fit together. Some common synonyms include: complement, mesh, blend, integrate, harmonize, coordinate, interlock, dovetail, unify, and synchronize. Each of these words describes the way in which different pieces or elements can come together to create a seamless and functional whole. Whether you are talking about the pieces of a puzzle, the components of a machine, or the talents of a team, finding the right words to describe how they fit together can help you communicate your ideas more effectively.