This article examines the problem of teaching foreign language vocabulary in bilingual conditions. The importance of this article is due to the fact that the emphasis is placed on the study of qualitative characteristics of foreign language vocabulary in the conditions of chechen-russian bilingualism, which can affect communication in the study of native, russian and foreign languages. In the process of teaching foreign language vocabulary in the conditions of chechen-russian bilingualism, it is accompanied by additional difficulties, which are manifested due to the interaction of different lexical systems of the contacting languages. It should be noted that the difficulties of mastering the spelling features of lexical units are due to the peculiarities of german spelling, which is characterized by numerous rules for combining letters when writing and exceptions. The result of the research is the conclusion that the proposed classification of the development of lexical units of the german language, as practice shows, is an effective means for bilingual students to overcome difficulties in the process of forming a foreign language lexical competence.