What is the greek word for princess?

There isn't one single Greek word for "princess" in the modern sense. The closest translations would be:

* Πριγκίπισσα (Pringekipsa): This is the Greek word for "princess" as a royal title, but it's a modern word derived from the French "princesse."

* Κόρη (Kori): This word means "daughter" and could be used to refer to a princess, but it doesn't specifically indicate a royal title.

* Βασίλισσα (Vasilissa): This word means "queen" and could be used to refer to a young queen or a princess who will eventually become queen.

So, while "Πριγκίπισσα" is the most accurate translation, you can also use other words depending on the context.