The word worldshaking signifies an event or incident that has a profound impact on the world. There are several synonyms that can replace worldshaking, such as epoch-making, earth-shattering, momentous, groundbreaking, historic, and seismic. These words are often used to describe events that have the potential to change the course of history, like the invention of the printing press or the first moon landing. They indicate a momentous change or a significant breakthrough that can leave a lasting impact on the world. Each of these synonyms brings a unique element to the table, but they all convey the magnitude of the event being described.