A jack plane is a woodworking tool that is used for leveling and smoothing wood surfaces. However, there are many synonyms for the word "jack plane" depending on the location or type of tool. In the United Kingdom, the word "fore plane" is used instead of jack plane. Another synonym for jack plane is "bench plane," which refers to the plane's primary use on a workbench. However, some carpenters or woodworkers may refer to jack plane as a "No. 5 plane" because of its size and shape. Additionally, the term "smoothing plane" is sometimes used as a synonym for the jack plane because of its ability to smooth and level surfaces.