Directly related to "govern":
* Government: The group of people who rule a country or state.
* Governance: The process of governing.
* Governor: The head of government of a state or province.
* Governable: Capable of being governed.
* Misgovern: To rule badly.
* Self-governing: Ruling oneself or having the power to rule oneself.
Related to "govern" through meaning:
* Governmental: Relating to government.
* Governing: Having the power to rule or control.
* Overgovern: To rule too strictly.
* Undergovern: To rule too lightly.
* Governed: Controlled or ruled.
* Governed by: Subject to the rule of.
Less common but still related:
* Governorship: The position of a governor.
* Ungovernable: Impossible to govern.
* Misgovernance: Bad or corrupt government.
There are also a few words that share the same Latin root word "gubernare," but are not directly related to "govern":
* Gubernatorial: Relating to a governor.
* Gubernatrix: A female governor.
This list is not exhaustive, but it provides a good starting point for exploring words related to "govern."