The Tocharian B word ṣpel
Word ṣpel
ʂ p e l
IPA ʂpel
Meaning mud
See also Homeric Greek: πηλός ‘clay, earth’

Comments
Douglas Q. Adams, “Etymological Dictionary of Tocharian B”, 1999, Brill

Other words that might be of interest
stām ‘tree’, wartto ‘forest’, karāś ‘forest’, kärweñe ‘stone’, warañc ‘sand’, tweye ‘dust’, keṃ ‘earth’, taur ‘ash, dust’, ṣale ‘mountain’, tsrerme ‘ditch’, murye ‘ditch, irrigation’, āre ‘dust’, spaitu ‘dust’, kenätstse ‘earthly’, dvīp ‘island’, prenke ‘island’, warañce ‘sand’, or ‘wood’