Backstop and Chains

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

Chains and backstop are semantically related. in barrier used to enclose a piece of land topic. In some cases you can use "Chains" instead a noun "Backstop".

Chains noun - Metal shackles; for hands or legs.

Backstop and chains are semantically related. Sometimes you can use "Backstop" instead a noun "Chains".