Barbed wire and Backstop

Barbed wire noun - Strong wire with barbs at regular intervals used to prevent passage.

Backstop and barbed wire are semantically related In some cases you can use "Backstop" instead a noun phrase "Barbed wire".

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

Barbed wire and backstop are semantically related in barrier used to enclose a piece of land topic. You can use "Barbed wire" instead a noun "Backstop".