Codex Cumanicus is a two-part work compiled in the 14th century by Italians and Germans from the Kypchak (Kuman) Turks in the north of the Black Sea. Perhaps it is the only compact heirloom of the Kypchak Turkish accent. In this manuscript, known as Codex Cumanicus in scientific circles, collective information on the language of Cuman Turks is given. Codex Cumanicus, which is an extremely important source in terms of Turkish dialect research, contains a dictionary of Kypchak (Kuman) Turkish, which is the common agreement and trade language of various Turkish tribes living in the north of the Black Sea and some nations speaking different languages, and important religious texts belonging to Christianity. Codex Cumanicus is a very valuable work for both the contemporary Kychak group and all Turkish dialects, both because of its vocabulary and because the work's alphabet reflects the period's language better than the Arabic language.Various studies have been carried out on the similarities and parallels between the Kypchak Turkish vocabulary of Codex Cumanicus and some contemporary Turkish dialects in the Kypchak group. However, in this article, the words that are common in the Codex Cumanicus and Afghanistan Kypchak Turkish are investigated.