* Ammamma (അമ്മമ്മ): This refers to the mother's mother (maternal grandmother).
* Achanamma (അച്ഛന്മ്മ): This refers to the father's mother (paternal grandmother).
You can also use the more general term Moossamma (മൂസമ്മ), which refers to grandmother in general, but it is less common in everyday usage.