The dictionary shows the structure of word formation of about 40,000 words included in word-forming nests. These nests are about 10,000. At the head of each are the source words arranged alphabetically, in the derivative words formed from the source words, all the elements of the word ( prefixes, suffixes, endings) involved in word formation are highlighted. All words are provided with accents, if necessary grammatical comments . At the end of the book are placed "Basic rules of Russian spelling" (with their help you can easily understand why this or that word is written this way), as well as "Words that need to be memorized." The dictionary is addressed to a wide range of readers. It will be useful, in particular, for students, teachers and anyone who wants to write and speak Russian correctly.