The article is devoted to the peculiarities of functioning of the conceptual fields “wealth” with monolexical and polilexical units in the English language. The author begins her theoretical research by presenting the approaches to defining the term”concept” by different scholars. It is regarded as either a linguistic-cognitive or a cultural-linguistic phenomenon. Then we analyse the theory of “the concept” suggested by Yuri Stepanov, confronting it with the opinions of others and expressing our personal point of view. The concept, unlike the word, has a more complicated structure. Its content is divided into linguistic meaning and cultural sense. The study of the vocabulary from the point of view of systematization and structuring into subsystems of different areas has recently become of paramount importance. The conceptual field is defined as a complex structure, which provides interconnected components verbalizing various aspects of the field. The field is not viewed just as a collection of concepts whose features are ordered in a certain hierarchy but as a system of overlapping cognitive structure. For this contribution, we consulted the works of different linguists who carried out research on the theme such as Western scholars: J. Trier, G. Ipsen, V. Porzig, J.Lyons, V. Evans, E. Coserio, Russian scholars: D. Lihacev, and Yu. Stepanov as well as Moldovan researchers S. Berejan, A. Ciobanu and V.Bahnaru. Monolexical units have been selected for the semic analysis of the constuents of the fields. Numerous examples of polilexical units are offered and their classification is presented