Heads-up and Look out

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

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

Look out verb - Be vigilant, be on the lookout or be careful.

Heads-up and look out are semantically related. Sometimes you can replace phrase "Heads-up" with "Look out", this terms are similar.