A splash-guard is a useful tool that protects against splashes of water, mud, or other liquids. However, there are several synonyms for this word that you could use to describe such a tool. For instance, a mud-flap is another name commonly used for splash-guards on vehicles. Similarly, splash-shields, mud-guards, or simply guards could all be used to describe the same thing. Each of these terms has a slightly different connotation or usage, but they all ultimately refer to a device that helps prevent unwanted splashing or spraying. So if you're looking for a synonym for splash-guard, consider trying one of these other popular names.