Fail-safe and Safety net

Fail-safe noun - A measure taken to preclude loss or injury.

Safety net and fail-safe are semantically related. In some cases you can replace phrase "Safety net" with "Fail-safe", this phrases are similar.

Safety net noun - A large strong net to catch circus acrobats who fall or jump from a trapeze.

Fail-safe and safety net are semantically related. Sometimes you can use "Fail-safe" instead a noun phrase "Safety net".