Ping-pong balls are small, lightweight balls used in the sport of table tennis. They can also be used for games, crafts, and other activities. If you're looking for synonyms for ping-pong balls, you might consider words like table tennis balls, ping balls, or even just balls. Other options could include bouncy balls, toy balls, or mini balls. Depending on the context, you might also use terms like lightweight balls or small balls to describe ping-pong balls. Ultimately, the choice of synonym might depend on the specific purpose or use you have in mind, but there are plenty of options to choose from.