Splashdown refers to the act of a spacecraft or object landing on water. If you want to use a different word to describe this event, there are several synonyms available. Some of these synonyms include touchdown, submergence, immersion, descent, and impact. Each of these words provides a slightly different nuance to the act of landing on water. Touchdown, for example, highlights the moment when the craft touches down on the surface. Submergence and immersion emphasize the idea of sinking into the water. Descent emphasizes the downward motion of the landing while impact conveys the forceful landing. Overall, there are several synonyms available to describe any type of water landing.