The phrase "what if" is commonly used when pondering the possibilities of a certain situation. However, there are several synonyms that can be used to replace this phrase. "Suppose" is a popular alternative that can be used in both formal and informal settings. "Imagine" is also a great option that encourages creative thinking. "If only" is commonly used when considering a missed opportunity, while "in the event that" is a more formal and refined synonym. Additionally, "what would happen if" is a more direct way of asking the same question. Ultimately, all of these synonyms serve the same purpose: to explore the potential outcomes of a certain scenario.