* High-level (with a hyphen)
* High level (without a hyphen)
Both spellings are correct, and the choice often depends on style preferences or the context.
Here's a general rule of thumb:
* Hyphenate when used as an adjective: "They had a high-level meeting."
* No hyphen when used as a noun phrase: "We're looking for someone with high level experience."
Ultimately, it's best to check your preferred style guide or the specific publication guidelines for the most accurate spelling.