Heads-up and Head up

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

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

Head up verb - Be the first or leading member of (a group) and excel.

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