Formal:
* Paatti (பாட்டி): This is the most common and respectful way to address a grandmother.
* Aatchi (ஆச்சி): This is also a respectful term used for a grandmother.
Informal:
* Ammamma (அம்மாமா): This is used for maternal grandmother.
* Paatiyar (பாட்டியார்): This is used for paternal grandmother.
* Aathi (ஆத்தி): This is a familiar way to call a grandmother, particularly in some regions.
The choice of term often depends on the speaker's age, social status, and relationship with the grandmother.