The head of Germany's government is called the Federal Chancellor, or just Chancellor.
German
The head executive of a state government is called a governor.
The head executive of a state government is called the Governor.
The head of government in Germany is called the Chancellor.
The head executive of the government in the United States is called the President. In some countries the head is the Prime Minister.
Monarchy
Chancellor
mayor
The head of the parliamentary government is called the Prime Minister.
The head of New Spain was called a Viceroy.
In most cases, the head of a municipal government is the position called "mayor".
It is called a theocracy.