The Proto-Turkic word *ōču-
Word *ōču-
Meaning thin, light, easy, worthless, youngest, to diminish
Synonyms *jar-, *jiŋč-ge, *kor(a)-

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
*köl- ‘shadow, to shadow’, *jal-ɨn ‘flame’, *ört ‘flame, to burn, steppe fire, to get burnt’, *ōt ‘fire’, *tüt- ‘smoke’, *gün(eĺ) / guńaĺ ‘sun, day, sunny place, sun-heat’