Abstract
Although the theory of substantivization has been considered in Kazakh linguistics since the first half of the twentieth century, there are numerous unresolved issues. For instance, the substantivization of pronouns, adverbs, and numerals remain to be poorly studied. Consequently, in our article, we examined the substantivization of participial forms and delineated the principal indicators that elucidate the nature of substantivization. Furthermore, the ways of formation and the scope of application of names derived from substantivized participles. The main purpose of this article is to elucidate substantivized participles from the cognitive basis, delineate their word-forming and functional nature. The article is based on scientific opinions, principles, theoretical concepts and notions related to substantivization in linguistics. The names created by the forms of substantivized participles were analysed, and their function in the sentence was considered. Furthermore, substantivised words were regarded conditionally as fully and partially substantivised ones.