On the issue of isomorphism of word-formative core and lexis-semantic system (by way of example of word-formative core with the top "arm")

There is discussed the word-formative core as a difficult, complex unit of the system of word-formation, and as hierarchically ordered totality of lexemes which finds out features of isomorphism with lexis-semantic system of the language. There are series of analogies in the article which are between two these structures. The comparison is illustrated by the noun "arm", which possesses rich word-formative facilities in the national Russian language.