Purpose and tasks. The purpose is to actualize the linguistic heritage of S. Karavanskyi as a basis for further prescriptive linguistic research. Among the tasks is the analysis of spelling and lexicographic codification in the works of a linguist. The object of our study is the linguistic heritage of Sviatoslav Karavanskyi, who after more than 30 years of Moscow-Stalin concentration camps and 37 years of American emigration carried, preserved and motivated the specific linguistic norm of the constantly destroyed Ukrainian language and its native speakers. The subject of our research is spelling and lexicographic codification of the first third of the XX-XXI century in the works of S. Karavanskyi. When processing the material, we use the analytical and descriptive method. Conclusions and prospects of the study. Spelling issues in the works of S. Karavanskyi have a substantiated ideological basis, which is to reflect the spelling of specific rather than assimilative (“destructive”) features caused by the occupation and totalitarian regime of the 30-80s of the XX century. Spelling assimilation and the necessity to remove it is to change the phonetic-morphological and syntactic structure of the Ukrainian language, in particular phonetic, morphological, word-formation and syntactic changes. The lexicographic codification of the linguist is evidenced by his two fundamental works: “Practical Dictionary of Synonyms of the Ukrainian Language” and “RussianUkrainian Dictionary of Complex Vocabulary”. The main methodological basis for compiling these dictionaries is the specificity of Ukrainian vocabulary in its resistance to codification in dictionaries of “pseudo-language” imposed on Ukrainians during the ethnocide policy and exposing Soviet lexicography as the main “tool of Ukrainian linguicide”. Among the prospects of our study is a holistic linguistic and political portrait of a linguist and socio-political figure.