The noun 'chief' is a word for a leader or ruler of a people or clan; a word for a person with the highest rank in an organization; a word for a person.
The adjective 'chief' is a word used to describe a noun as most important; as the main, principle, or primary.
Chief Audit Executive
Chief Executive Officer
Chief Minister
chief of naval operations
chief value cotton
chief executive officer
Chief Executive Officer
Chief executive officer.
In business, CBO can stand for Chief Banking Officer or Chief Business Official
Detective Chief Inspector
Master Chief Petty Officer Of The Navy
Chief Medical Officer