Difference between Autocracy and Dictator

What is the difference between Autocracy and Dictator?

Autocracy as a noun is a form of government in which unlimited power is held by a single individual. while Dictator as a noun is originally, a magistrate without colleague in republican ancient rome, who held full executive authority for a term granted by the senate (legislature), typically to conduct a war

We hope you now know whether to use Autocracy or Dictator in your sentence.