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The article examines the Kazakh and Nogai languages, which according to the classification of Turkic languages, belong to the Kipchak branch. A lexico-semantic analysis of common nouns in these languages was conducted to determine their specific features. To broaden the scope of the comparative historical direction of linguistics, the present study holds significant importance for the fields of semantics and etymology of Turkic languages. It is noteworthy that the Nogai and Kazakh languages, which were closely in contact with each other during historical development, exhibit similarities in their grammatical and phonetic systems across linguistic units. The names of weapons, religious concepts, livestock, household items, certain traditions, and customs found in historical epic poems language exhibit a lexical layer that demonstrates their proximity. It is known that today, languages have diverged from each other due to various historical, and economic conditions, and territorial distances. Research shows that they have even adopted features from other unrelated languages. However, the fundamental nature of Turkic languages, which share a common origin, has remained intact. These foundational features pave the way for scientific inquiry. By examining common words across related languages, it is possible to uncover linguistic characteristics and enrich the corpus of today's linguistic studies with hidden linguistic information.
A.Kh. et al. (2024) studied this question.