Surfacer is a term used to describe a tool or machine that flattens or smooths a surface. There are many synonyms for this word, depending on the specific context. Some common alternatives include grinder, planer, sander, polisher, and scraper. These words can refer to an electric or manual tool, and each is designed for a specific type of surface preparation. For example, a grinder is often used to remove material from metal or stone, while a planer is used for leveling boards or other wooden surfaces. Choosing the right synonym for surfacer depends on the task at hand and the desired outcome.