A "wakeup call" is an important signal that helps an individual or a group to understand the reality of a situation. Sometimes, we need to use different words to express the same idea or sentiment. This can help to avoid redundancy and improve communication. There are several synonyms for "wakeup call" that can be used in different contexts. For example, "reality check," "eye-opener," or "awakening" are synonyms that mean the same thing as "wakeup call." These words can be used to express the realization or the sudden awareness of a significant situation that one needs to take action on to address its effects.