A "death note" refers to a written record of a person's impending death, often caused by illness or other tragic circumstances. Synonyms for death note include "last will and testament," "final words," or "farewell message." Additionally, "end-of-life plan," "death announcement," and "posthumous document" are other terms that can be used to describe a death note. While the content of a death note can vary depending on the author and the circumstances surrounding their death, it typically serves as a final goodbye and a way to ensure that their wishes are known and respected after they have passed away.