The plural of "chief executive" is "chief executives"
There are different titles for the chief executive. In some countries the chief executive is call president. In many companies, he or she is called the chief executive or chief executive officer.
Individually, chiefs, executives, officers. Collectively, Chief Executive Officers
Chief Executive Officer
The US Government Chief Executive is the President.
The President is chief executive of the Executive Branch of the US government.
Chief executive or chief executive officer (CEO).
CEO: Corporate Executive Officer
MayorThe mayor is chief executive of a city.
Chief Executive Officer Chief Executive Officer
The chief state executive is the governor of the state.
Not just the "executive." One of the titles for the president is the "Chief Executive," and another is the "Commander in Chief."