Monarchy is a form of government where one person, a monarch, rules over a country, kingdom, or empire. The power is passed on through the right of hereditary succession, or very rare circumstances, an election (elective monarchy). A monarch may hold their position until death or abdication. Some countries with the monarchy system of government are Japan, Sweden, and the Commonwealth of Nations ruled by Queen Elizabeth II.
Dictatorship is a system of government distinguished by a person's absolute rule over a country, kingdom or empire, without any effective constitutional limitations, as most monarchs do. Most dictators gain their power through force or fraud in elections, and once elected, alter the whole political system to ensure no one will take their power.