dictator
[noun]
Synonyms: absolute ruler, autocrat, despot, oppressor, tyrant

[TahlilGaran] English Synonym Dictionary ▲

dic‧ta‧tor /dɪkˈteɪtə $ ˈdɪkteɪtər/ noun [countable]

1. a ruler who has complete power over a country, especially one whose power has been gained by force:
the downfall of the hated dictator

2. someone who tells other people what they should do, in a way that seems unreasonable:
a real little dictator

[TahlilGaran] Dictionary of Contemporary English ▲