You can also use:
* "Witaj" (pronounced "vee-tie-ye") which is a more formal greeting, similar to "hello"
* "Dzień dobry" (pronounced "dzen do-bree") which is a very formal greeting, used in situations like business meetings or when addressing someone much older.
It's important to note that Polish greetings are very context-dependent, and the best choice will vary depending on the situation and your relationship with the person you're greeting.