Özet:

Language, which is a means of communication in interpersonal relations, is a living and social entity. Since change is inevitable for living beings, language does not stay out of these changes and developments, and it can change depending on the operating rules of its own system in line with new needs. When the background of the Turkish language extending from the past to the present is examined, it is possible to find the traces of the changes and developments experienced due to different reasons. The rich suffix system of the Turkish language increases the expressive power of the language by allowing a linguistic task to be fulfilled with different structures. This situation contributes to the fact that the affixes take on semantically different tasks in the syntax and to enrich them in terms of functionality. In determining the functional features of the affixes, an equalization process can be applied by comparing the structures in which the affixes are included with each other in terms of functionality. With such equalization studies, it can be revealed that affixes that have different functions are used in the same or similar meaning in the syntactic structure. In Turkish, it is seen in historical and contemporary dialects that a suffix assumes the meaning and function of another suffix besides its original function. It is observed that different suffixes are sometimes used with the same meaning and function in the Old Anatolian Turkish period, which is the first period of Western Turkish. In the works of this period, one of the functional equivalences between different suffixes is seen between -dUk adjective-verb suffix and -mA noun-verb suffix. In this study, the equivalent functional properties of the adjective-verb suffixes -dUK and -mA noun-verb suffixes in Old Anatolian Turkish will be examined on the examples taken from the texts of the period.

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