Cap-shaped is a term that is usually used to describe objects or structures that resemble the shape of a cap, such as mushrooms, flowers, and even some architectural designs. However, if you're looking for synonyms for cap-shaped, you might consider using words like domed, rounded, convex, arched, or even bulbous. Each of these terms describes objects that have a similar shape to a cap, but with slightly different connotations. For instance, dome-shaped implies a slightly more elevated shape, while rounded might imply a more gradual curve. Ultimately, the best synonym for cap-shaped depends on the context and the specific object you are trying to describe.