Backstop and Roadblock

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

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

Roadblock noun - Any condition that makes it difficult to make progress or to achieve an objective.

Backstop and roadblock are semantically related. You can use "Backstop" instead a noun "Roadblock".