Terms as a special type of words in the language system

In this article, the problem of classifying the lexical composition was considered as a multifunctional unit of language. It analyzes the aspect of the division of vocabulary, used primarily in science, technology, crafts and other spheres of communication. It summarizes the opinions of scientists who have drawn with considerable interest in describing the structure and main classes of special vocabulary in particular, terminology. Principal in the above discussion are questions about the coincidence or inconsistency of the class of professional vocabulary with a class of terms. In this connection, the term "professional vocabulary" acquires a number of socio-historical associations, caused by guild closeness and limited production under feudalism. So, the three main points of view on the ratio of "professional vocabulary -terminology" can be briefly described in the following way. The first of them identifies these two concepts. Meanwhile, it turns out that the allocation of the main classes of special vocabulary is fraught with considerable difficulties and, as a consequence, with a wide variety of points of view on this issue.