Eternal rest is a phrase commonly used to describe someone's death or passing. However, there are several synonyms that can be used to express the same thing in a different way. One common synonym is "final resting place," which refers to the burial location of a deceased person. Another synonym is "peaceful repose," which conveys the idea of a calm and peaceful state after death. "Eternal peace" is another phrase that can be used to describe the same concept, emphasizing the idea of a lasting and permanent state. Ultimately, the choice of synonym depends on the context and the tone that the writer or speaker wishes to convey.