Compound terms correspond to the criteria of compounds to a diff erent degree, which allows the author to consider them as a fuzzy set, structured from the perspective of the fi eld approach. Word formation fi elds of Russian and German clinical compound terms are structured in accordance with the diff erent compliance degree of terms with compound criteria. The research objective is to structure the word formation fi elds of Russian and German compound terms vertically. The research material constitutes samples of 1545 Russian and 2882 German clinical compound terms.