* Paatti (பாட்டி): This is the most common and widely used term for grandmother.
* Aatchi (ஆச்சி): This is another common term, often used in certain regions or by some families.
* Ammamma (அம்மாமா): This is a slightly more formal term used for maternal grandmother.
* Atha (அத்தா): This is a slightly more formal term used for paternal grandmother.
The choice of which term to use can depend on the region, family tradition, and personal preference.