autocracy
Dictator government
monarchy
Sovereign.
There are several terms for a supreme ruler (i.e one who has complete control). The exact one which applies depends on the design of the government itself:Absolute MonarchDictatorDespotTyrantAutocrat
In a Dictatorship government, there is just one ruler who takes over that country and its people. The people do not have any rights. Their beliefs are "dictated" by the government.
Usually a tyrannical government has a dictator.
Haiti has a semi-presidential republic form of government, so their "ruler" would be the president.
The Fertile Crescent maintained a government based on theocracy. In a theocracy, a deity is recognized as the ruler of the government.
The mian kinds are Absolute monarchy and Constitutional Monarchy. With an absolute monarchy, there is one spreme ruler who controls all of the land and the people with no higer form of government above with. With a constitutional monarchy, There is a ruler who is the leader of a government but does not have supreme power. (does not control everything but is still a part of the government)
An absolute monarchy is designed as such.
"Communist ruler" is contradiction in terms, since communism, by definition, is without government.