Backstop and Gym

Backstop noun - (baseball) a fence or screen (as behind home plate) to prevent the ball from traveling out of the playing field.

Gym and backstop are semantically related. In some cases you can use "Gym" instead a noun "Backstop".

Gym noun - A building or room used for sports activities and exercising.

Backstop and gym are semantically related. Sometimes you can use "Backstop" instead a noun "Gym".