The most popular approach to evaluate the semantic similarity of words and texts consists in using the semantic knowledge expressed in ontologies (Resnik, 1999); commonly, WorldNet is used for this purpose (Fellbaum, 2005).
unfortunately, despite the great effort that has been the creation of WordNet, it is still far to cover all existing words and senses (Curran, 2003).the semantic similarity methods that use this resource tend to reduce their applicability to a restricted domain and to a specific language.