A more thorough explanation:

Definition: The Chief Justice of the United States is the formal title of the officer who leads the Supreme Court of the United States.

For example, John Roberts is the current Chief Justice of the United States. He presides over the Supreme Court and is responsible for managing its operations and setting the agenda for cases to be heard.

The term "Chief Justice" is often used as a shorthand for the Chief Justice of the United States.

In history, the term "chief lord" referred to the immediate lord of a fee, to whom the tenants were directly and personally responsible.

These examples illustrate how the term "Chief Justice of the United States" refers to a specific position of leadership within the Supreme Court, while the term "chief lord" refers to a historical position of authority over tenants.