Select the most appropriate one-word substitution for the given group of words. 

Government by the populace or mob rule.

Ochlocracy

The most appropriate one-word substitution for government by the populace or mob rule is ochlocracy.

• Autonomy means self-government.
• Anarchy means a state of disorder due to absence or non-recognition of authority.
• Aristocracy means a government in which the supreme power rests with a small number of people of high birth.

The word ochlocracy is derived from the Greek words ochlos, meaning "mob", and kratos, meaning "rule". It is a form of government in which the mob or populace has the ultimate power. In ochlocratic societies, the laws and policies of the government are determined by the will of the majority, often without regard for the rights of individuals or minorities.