What is the Greek word for rule?

There isn't one single Greek word for "rule" as the meaning depends on the context. Here are a few possibilities, depending on what kind of rule you mean:

* ἀρχή (archē): This is a very common and versatile word. It can mean "beginning," "origin," "principle," "authority," or "rule" – especially in the sense of governing power or a fundamental principle.

* κύρος (kyros): This means "authority," "power," or "sovereignty," and thus implies the ability to rule.

* νόμος (nomos): This means "law," "custom," or "rule" in the sense of a regulation or established practice.

* βασίλεια (basileia): This means "kingdom" or "royal rule."

* ἡγεμονία (hegemonia): This means "leadership," "dominion," or "hegemony," which implies a form of rule.

The best translation will depend on the specific context. If you can provide the context, a more precise word can be chosen.