The article considers the etymological basis of the word kök in Kazakh linguistics. The Kazakh people's way of recognizing the linguistic image of the universe through the word kök is analyzed. In order to achieve this goal, the history of the origin of the word kök was analyzed based on the ancient Turkish dictionary, M.Kashkari's "Turkish dictionary", and the etymological dictionary of the Kazakh language. The main goal of providing the etymological basis of words related to the word kök is to show that the basis of root words related to the word kök lies in the Turkic languages themselves. In the article, the analysis of the etymology of the word kök was based on semantic and extralinguistic principles. The result of the study of the nature of the word kök and the phrases derived from it is the lexicology of the Kazakh language, semasiology, phraseology, cognitive linguistics, linguistic and cultural studies, etc.