Yukigassen is a Japanese word that refers to a snowball fighting festival. There are several other words that can be used as a synonym for this fun activity. One term is "snow battle," which describes the competitive aspect of the festival. Another term is "snow conflict," which emphasizes the challenging nature of the game. "Snow war" is also a good synonym, as it connotes a more intense battle. "Snow fight" is a simple and straightforward term that captures the essence of the activity. No matter what word is used, the excitement and joy of participating in a yukigassen event will always be the same.