The Proto-Turkic word yul
Word yul
Meaning stream, brook, fountain
See also Proto-Altaic: *ǯi̯ōlu ‘riverbed, stream’

Other words that might be of interest
*bū(n)ŕ < būĺ(V)-ŕ ‘ice’, *doŋ ‘cold, frost, frozen, to freeze, be frozen’, *jag- ‘rain, to rain’, *iak- ‘to flow’, *örs(en) ‘river, river bed, to flow’, *čɨj(ɨk) ‘wet, soaking, moist, dew, moisture’, *sɨb ‘water’, *dal-g- ‘wave’, *kōm ‘wave’, *bulak ‘spring, well’