Autocracy

Dictatorship: A form of government in which a country or a group of countries is ruled by one person or political entity, and exercise through various mechanisms to ensure the entity's power remains strong.

Totalitarianism: A political concept where the state recognizes no limits to its authority and strives to regulate every aspect of public and private life wherever feasible.

Despotism: It is a form of government in which a single entity rules with absolute power. That entity may be an individual, as in an autocracy, or it may be a group, as in an oligarchy.