Formal:
* Aroa: This is a very formal goodbye, often used in official situations.
* Aere ra: This is a slightly less formal version of "Aroa".
Informal:
* Tere: This is a more common way to say goodbye in everyday conversation.
* Tere ora: This is a slightly more affectionate way to say goodbye, meaning "goodbye, be well".
Other options:
* Nana: This is a more casual way to say goodbye, similar to "bye" in English.
* Ka kite: This means "see you" and is a good option if you will see the person again soon.
Important Note: The Cook Islands language is spoken with a wide range of regional dialects. While the words listed above are commonly understood, there may be variations depending on the specific island or community.