Epoxy is a popular material used for a variety of applications such as adhesive, coating, and sealant. However, there are several synonyms that can be used instead of epoxy. Resin, which is similar in composition to epoxy, is a common alternative. Polyester resin and vinyl ester resin are also used for similar purposes as epoxy. Other synonyms include cyanoacrylate, superglue, and polyurethane adhesive. These materials have different properties and strengths, and should be used based on the specific application. Ultimately, the choice of material will depend on the desired outcome and specific requirements of the project.