Wake-up signals are a familiar occurrence in our daily lives. They are designed to arouse and alert people from their sleep or inactivity. While the phrase 'wake-up signal' is commonly used, it has several synonyms that can be employed. The following are some suitable words that can be used interchangeably: alarm, alert, call, prompt, reminder, notification, signal, warning, summons, and cue. Any of the above-mentioned words can be used to replace 'wake-up signal,' depending on the context in which it is used. In conclusion, it is important to have alternative words at our disposal to express ourselves effectively in any given situation.