Here are some other words that can also be used:
* नाना (nana) - maternal grandfather
* दादू (dadu) - a more affectionate term for grandfather
* बापूजी (bapuji) - a respectful term for grandfather
* अज्जा (ajja) - a term used in some regions of India
The specific word used will depend on the region, family traditions, and the level of formality.