The Verb "To Govern" is actually the noun of the verb government.
Nouns like government, clan, group, family, etc., can be used to denote one whole entity or its members. So, they can be used as singular or plural verbs.
See the attached link for a few examples.
Chat with our AI personalities
The word enact is a verb. A sentence using enact: The NRA is concerned the government will enact a new gun control law.
"Impeach" is a verb. "Impeachment" is a noun.
Prohibition policy is to prevent whatever is prohibited.
The verb "ordain" can mean to officially enact, and "establish" means to found or define. This phrase in the preamble to the US Constitution simply means the Constitution is being put into place as the basis for the US government.
Tyrant is a noun, too, so the verb is "tyrannize".