From the point of view of studying the centuries-old history of the Turkish language, these<br> language monuments created by Turkish poets and writers in the Middle Ages are important sources. The study<br> of these monumentswritten in Turkish language, the study of their phonetic, lexical and grammatical features<br> also creates conditions for determining the literary norms of the Turkic languages. From this point of view, the<br> analysis of the vocabulary of “Jamshid and Khurshid”, a Turkish language written monument of the 14th-15th<br> centuries, is both important and interesting from the point of view of studying the existence of Turkic words.<br> In this article, the lexicon of Turkic origin has been studied in the language of Ahmadi’s masnavi “Jamshid<br> and Khurshid”, the words of Turkic origin involved in the research have been compared with their usage forms in<br> modern Turkic languages. As a result of the research, it has been found out that there are enough words of Turkic<br> origin among the nouns, verbs and numeral words used in the language of the monument. However, in the lexicon<br> of “Jamshid and Khurshid” verbs occupy a greater place among the words of Turkic origin. In the lexicon of the<br> 14th-15th century’swritten monument “Jamshid and Khurshid”, carrying the linguistic features of Anatolian<br> Oghuz Turkic, some of the words of Turkic origin have been preserved with minor phonetic changes, and some<br> have been preserved their functionalityas they are in modern Turkic languages.