The Hattic word pīp
Word pīp
Meaning stone
See also Greek: πυτνα ‘stone, hill, rock’

Other words that might be of interest
araz ‘earth’, wūr ‘land, country’, munamuna ‘stones’, ziḫar ‘wood, building’, zīš ‘mountain’, šaḫḫu ‘ground, bottom’, kantiuz ‘rock, boulder’, tiuz ‘mountain’