Heads-up and Injunction

Heads-up noun - The act or an instance of telling beforehand of danger or risk.

Injunction and heads-up are semantically related. In some cases you can use "Injunction" instead a noun phrase "Heads-up".

Injunction noun - A statement of what to do that must be obeyed by those concerned.

Heads-up and injunction are semantically related. Sometimes you can replace phrase "Heads-up" with "Injunction", this terms are similar.