From Wiktionary, the free dictionary
Inherited from Proto-Turkic *-rek. A cognate with Kyrgyz -реек (-reyek), Turkmen -räk, Uzbek -roq.
-рек • (-rek)
- -er (Used to form the comparative form)
- үлкен (ülken, “big”) + -рек (-rek) → үлкенірек (ülkenırek, “bigger”)