Tar paper is a heavy-duty felt paper that is coated with tar or asphalt to make it waterproof. It is often used in roofing and construction projects to protect against moisture and weather damage. There are several synonyms for tar paper, including roofing felt, asphalt felt, building paper, and underlayment. These materials serve the same purpose as tar paper and are typically made from similar materials. However, there may be slight differences in their composition and properties, depending on the intended use. Regardless of the specific name, these materials are essential for providing a durable and protective layer for buildings and structures.