Hindi:
* Papa: This is the most common and widely understood word for father.
* Pitaji: This is a more formal and respectful term.
Other Indian Languages:
* Abba: (Urdu, Punjabi)
* Appa: (Tamil, Telugu, Malayalam)
* Baba: (Bengali, Marathi, Gujarati)
* Aabba: (Kannada)
It's important to note that the specific word used varies greatly depending on the region and language spoken.