Here are some other Sanskrit words for "stone" depending on the context:
* pāṣāṇa (पाषाण) - rock, boulder
* śilā (शिला) - stone, rock, slab
* grāva (ग्राव) - gravel, pebble
* reṇu (रेणु) - dust, particle, sand
* kankara (कंकर) - pebble, gravel
* prastara (प्रस्तर) - stone slab, pavement
The specific word used would depend on the type and size of the stone being referred to.