Starting gate and Starting block

Starting gate noun - A movable barrier on the starting line of a race course.

Starting block and starting gate are semantically related In some cases you can use "Starting block" instead a noun phrase "Starting gate".

Starting block noun - Block providing bracing for a runner's feet at start of a race.

Starting gate and starting block are semantically related in starting point topic. You can use "Starting gate" instead a noun phrase "Starting block".