The article is devoted to the diachronic description of genetically close vocabulary of the East Slavic languages on the basis of the study of its origin and semantics in the context of the urgent problems of historical derivatology, lexicology and lexicography of Slavic languages. A lexical family and its variants are considered to be the main complex unit of the lexical-semantic system of language: the family of words – in certain synchronous sections in the history of each language; the root and etymological families – in the history of kin languages development. The author introduces the notion of lexical-semantic paradigm (LSP) – a system-forming unit which includes etymological nests connected with deep semantics underlying the intern...