Chief and Uppermost

Chief adjective - Highest in rank or authority.

Uppermost is a synonym for chief in main topic. In some cases you can use "Uppermost" instead an adjective "Chief", when it comes to topics like essential, primary.

Nearby Word: chiefly

Uppermost adjective - Being at a point or level higher than all others.

Chief is a synonym for uppermost in predominant topic. You can use "Chief" instead an adjective "Uppermost".