What tool is specifically designed to cut curves in wood?

The coping saw is specifically designed to cut curves in wood due to its thin, narrow blade and the ability to pivot at the handle. This design allows for more intricate and detailed cuts compared to other saws. The blade can be replaced, and its tension can be adjusted, making it particularly suitable for cutting shapes such as curves and circles.

In contrast, circle snips are typically used for cutting metal or other thin materials but are not used for wood cutting. The hacksaw, while versatile, is primarily designed for cutting metal and makes straighter cuts rather than curves. The ripsaw, on the other hand, is made for cutting along the grain of the wood, primarily producing straight cuts and is not intended for curved work. Thus, the coping saw stands out as the tool best suited for this specific task.