The research aims to identify the lexical semantic link between units of the terminological field of combinatorial linguistics, which studies syntagmatic relations of language units and their combinatorial potential. The article considers principles of creating a lexical semantic diagram and types of relations between its units within the field. Scientific novelty of the research lies in identifying lexical semantic relations between terms of combinatorial linguistics and in creating a lexical semantic model. As a result of the research, a lexical semantic diagram of the terminological field of combinatorial linguistics has been developed and types of relations between terms - synonymy, antonymy, hyponymy and meronymy - have been determined.