The Proto-Turkic word teŋri
Word teŋri
Meaning god, sky, heaven

Comments
Could be a loan from Yenisseian *tɨŋgVr- ‘high’.

See Georg S., Türkisch/Mongolisch tengri ‘Himmel, Gott’ und seine Herkunft. Studia Etymologica Cracoviensia, vol. 6, 2001.

Other words that might be of interest
*bulut ‘cloud’, *āń(k) ‘moon, month’, *bus ‘steam, fog’, *jul-du-ŕ ‘star’, *gün(eĺ) / guńaĺ ‘sun, day, sunny place, sun-heat’