Common Options:
* परनानी (Parnaani): This is a common term for great grandmother, often used in North India.
* नानी की नानी (Naani ki Naani): This literally translates to "grandmother's grandmother" and is a more formal way to refer to a great grandmother.
* दादी की दादी (Dadi ki Dadi): Similar to the above, this translates to "grandmother's grandmother" but uses the term "Dadi" for grandmother, which is common in some regions.
Other Options:
* माता की माता (Maata ki Maata): This literally translates to "mother's mother."
* अम्मा की अम्मा (Amma ki Amma): Similar to the above, this translates to "mother's mother," but uses the term "Amma" for mother, which is common in South India.
The best option for you will depend on the specific context and the region you are in.