High-up and High up

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

High up and high-up are semantically related In some cases you can use "High up" instead the phrase "High-up" as a noun or an adjective.

High up adverb - At a great altitude.

High-up and high up are semantically related in eminent topic. You can use "High-up" instead the phrase "High up" as a noun or an adjective, if it concerns topics such as important, chief, high-ranking.