Headliner and High-up

Headliner noun - The person who has the most important role in a play, movie, or TV show.

High-up and headliner are semantically related. In some cases you can use "High-up" instead a noun "Headliner".

High-up noun - An important or influential (and often overbearing) person.

Headliner and high-up are semantically related. Sometimes you can use "Headliner" instead a noun phrase "High-up".