Essential and High-level

Essential adjective - Impossible to do without.

High-level and essential are semantically related. In some cases you can use "High-level" instead an adjective "Essential".

Nearby Words: essence, essentially, essentiality

High-level adjective - At an elevated level in rank or importance.

Essential and high-level are semantically related. Sometimes you can use "Essential" instead an adjective phrase "High-level".