This article describes the formation of synonyms in dictionaries. In our era, during the great social transformations and unprecedented scientific and technological advancement, languages are developing rapidly, with a variety of words that reflect the new concepts that emerge in various fields of science, technology and culture. The use of vocabulary is а great importance in theoretical research and practical teaching of language. Creating different types of dictionaries isvery important. Synonyms dictionary includes the meaning of the language and describes close words. These dictionaries are important as a practical guide for the correct and proper use of the synonymy in the language.