Chiliasm is a concept that has multiple synonyms that can be used interchangeably depending on the context you are referring to. Some of the most common synonyms for Chiliasm include millenarianism, millennialism, and apocalypticism. These words share the same root with Chiliasm, which means to believe in a coming golden age that will be ushered in by the return of Christ. Additionally, you can also use the word eschatology to refer to this concept, which means the study of the end times. Overall, it is important to have a good understanding of these synonyms to communicate your ideas effectively.