Here are a few common terms:
* Kuia: This is a general term for an elder woman, and it can be used for a grandmother. However, it's more common to use a more specific term.
* Nana: This is a common and affectionate term for grandmother. It's similar to the English "Nana."
* Nanai: This term is similar to "Nana" but can be more formal.
* Koroua: This term refers to a grandfather, but it can also be used for a grandmother in some families.
It's important to remember that these are just a few examples, and the specific term used can vary depending on the family and region.
To be respectful, it's always best to ask a Maori person how they prefer to be addressed.