The traces of Turkish T-/K- equivalence in Persian language

In Persian language there are several words beginning with t- which occur as words beginning with k- in Turkish language without difference in their senses. Moreover, there are several words in Persian language beginning with k- which occur as words beginning with t- in Turkic language without difference in their meanings. As known phonetic values of the t and k consonants are different. Up to now, the problem of initial t-/k- has not been dealt with in the relations of Turkish and Persian languages. In this review we wanted to explain this problem. In our investigation, examining modern and historical Turkic and Persian languages, discusses t-/k- correspondence as it is observed in the words such as kırık “broken”/ terek “fracture”, tāvel “swollen wound” / kabar “swollen wound”, kırış- “to wrinkle” / terenc- “to wrinkle”, kere “butter” / tere “butter”. This study tries to answer the question of the source of this equivalence. Therefore, this equivalence of the words displaying t- and k- in the new Persian and new Turkish dialects are reviewed in ancient and early Persian languages end early Turkish resources too. Also, we searched the root of this words in the Indo-European language family and Altaic language family.