The Hittite word pu-ru-ut
Word pu-ru-ut
Meaning soil, mud, earth, plaster
See also Homeric Greek: φύρω ‘mix’
Hattic: pur ‘earth’
Synonyms te-e-kan

Comments
Puhvel (1994: 255) suggests a connection to Greek φῡ́ρω 'to mix', because mud is a mixture of water and clay. The reconstruction of PIE *bhur-u-t- remains controversial.

Other words that might be of interest
ḫa-a-aš ‘ashes, dust, soap’, ta-a-ru ‘wood, tree’, ut-ne-e ‘land’, al-la-an-ta-ru ‘oak’