High-five and Hi

High-five noun - A gesture of greeting or elation; one person's upraised palm slaps the upraised palm of another person.

Hi and high-five are semantically related. In some cases you can use "Hi" instead a noun phrase "High-five".

Hi noun - An expression of greeting.

High-five and hi are semantically related. Sometimes you can replace phrase "High-five" with "Hi", this terms are similar.