What term describes a person opposing all forms of government?

The term that describes a person opposing all forms of government is "anarchist." Anarchism is a political philosophy that advocates for a society organized without hierarchical authority, particularly rejecting government as a legitimate means of social organization. Anarchists believe that individuals can govern themselves without the need for a governing body, stressing voluntary cooperation and mutual aid instead of imposed laws and regulations.

In contrast, libertarians advocate for minimal government intervention in personal and economic matters but do not oppose all forms of government; they seek to limit its power rather than eliminate it entirely. Autocrats are leaders who hold absolute power, often in a centralized and oppressive manner, which is contrary to the principles of anarchism. Revolutionaries seek to overthrow existing systems of government, but they are generally not opposed to all forms of government; instead, they usually aim to replace one system with another.