The Proto-Turkic word *japur-gak
Word *japur-gak
Meaning leaf

Comments
S. A. Starostin, A. V. Dybo, O. A. Mudrak - An Etymological Dictionary of Altaic Languages, 2003, Brill

Other words that might be of interest
*üŋ- ‘to dig, delve, hole, cave’, *čɨ̅p ‘branch’, *urug ‘seed, kin’