Synonyms of autocrat
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despotA despot is a ruler or other person who has a lot of power and who uses it unfairly or cruelly.
• He described the president as a ruthless despot.
dictatorA dictator is a ruler who has complete power in a country, especially power which was obtained by force and is used unfairly or cruelly.
• the fall of Haiti's military dictator
Thesaurus for autocrat from the Collins English Thesaurus