Abstract: The subject of this research is the problem of word formation in the Crimean Tatar language. The object of this research is the synonyms in the Crimean Tatar language. Synonyms contribute to clarity of expression of one or another meaning, enrich the literary language and enhance its expressiveness. The goal of this work consists in examination of word formation capabilities in the Crimean Tatar language as a source of synonymy. An important question for understanding the nature of synonymy in lexical-semantic composition of the modern Crimean Tatar language is the questions on the factors of the emergence of synonyms. In the Crimean Tatar linguistics, this question requires a detailed examination. The novelty of this research lies in the analysis of word formation as a source of synonymy. A conclusion is formulated that the lexicon of Crimean Tatar language is being enrich mostly due to the word formation. The rich word formation capabilities of the language allow creating a wide variety of derivatives based on the existing patterns. The skill of using the word formation capabilities of the language significantly enriches the speech, allows to create lexical and semantic neologisms, expands synonymy of the language. Word formation is one of the source of synonymy.