Putting guard is a term used in golf to describe a tool that is placed behind the ball on the green to prevent it from moving while putting. However, there are other terms that can be used interchangeably to describe this tool. One example is a ball marker, which is used to mark the position of the ball before it is lifted from the green. Another term is a coin, which is commonly used as a ball marker. Some golfers also use a tee as a putting guard, which provides enough clearance for the ball to roll over while putting. Overall, these synonyms can be used to describe any tool or object that serves the purpose of marking the ball position while putting.