The Proto-Turkic word *köp
Word *köp
Meaning many
Synonyms *čok

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
*e̟k(k)i ‘two’, *üč, öč ‘three’, *tokuŕ ‘nine’, *ạbuč- ‘handful’, *āŕ ‘few, a little’