This paper arose out of research carried out at LDI (UMR 7187, CN RS-Université Paris 13) on a description of French nominal predicates with a view to creating an electronic dictionary. The principles of the analysis, which we implement, are the same both for general language predicates and for specialized language predicates. We select the class of nouns of ‘thinking processes’ from general language and nouns of ‘diseases’, ‘therapeutic action’ from the language of medicine in order to illustrate two types of semantic classes, namely, the class of synonyms and the class of hyperonyms. The two types refer to internal semantic relations which do not display, by themselves, any criteria for classification. All the structural, distributional, syntactic, and semantic properties, when integrated, are taken into account. An integrated description answers the demands of software which processes language data to the extent that the properties are incorporated into electronic dictionaries.