They are all different types of government
Monarchy -> Tyranny -> Aristocracy -> Oligarchy -> Polity -> Mobocracy -> back to Monarchy
Monarchy Tyranny Aristocracy Oligarchy Democracy Ochlocracy
According to Aristotle: Monarchy (Rule by One) which degraded to Tyranny (Rule by an absolute ruler) Aristocracy (Rule by the Best) which degraded to Oligarchy(Rule by the Few) Democracy (People Power) which degraded to Ochlocracy (Mob Power).
Yes. The idea behind a Republic is that all matters of state are considered a public matter, and those voted into office are done so by election. An oligarchy isn't a "proper" form of government - it simply states that power rests in the hands of a small, select group. This could be a monarchy, hierarchy, aristocracy, plutocracy, etc. Even a Republic can be a de factooligarchy.
Direct Democracy, Tribal Rule, Absolute Monarchy, Dictatorship, Oligarchy, Constitutional Monarchy and Representative Democracy.
Aristotle classified six forms of political constitution: tyranny, monarchy, oligarchy, aristocracy, democracy and finally, polity
According to Aristotle, there are three main types of government: monarchy, aristocracy, and polity. Monarchy is a rule by a single individual, aristocracy is rule by a few elite individuals, and polity is rule by the many, or the common people. Aristotle also recognized that each of these forms of government can devolve into a corrupt or unjust version: tyranny, oligarchy, and democracy, respectively.
Aristotle's typology of government includes monarchy (rule by one), aristocracy (rule by the virtuous few), and polity (rule by the many or the middle class). He also discusses their corrupt forms: tyranny, oligarchy, and democracy, respectively.
An Oligarchy = rule by the few. Aristotle said that an Oligarchy was a degraded form of Aristocracy = rule by the best. Sparta was a limited democracy - citizens in assembly voted on issues put before them but could not discuss or raise issues. Athens became a radical democracy where citizens in assembly raised, discussed and decided on issues.
As an oligarchy is a ruling aristocracy or self-selecting elite, curiously, most modern 'communist' countries, such as China, Vietnam and Cuba, qualify. North Korea seems to have decided monarchy is better.
Machiavelli's theory of government is called Kyklos. This is a cyclical government that rotates from democracy to aristocracy to monarchy and then ochlocracy to oligarchy to tyranny and finally anarchy.
Over the centuries it changed from monarchy, yooligarchy, to tyranny, to oligarchy to limited democracy, to oligarchy, to monarchy.