This paper compares several quality measures used to order the terms of a corpus of speciality. We also explain the improvements we brought to these measures. The terms are said to be relevant when a domain expert declares they are linguistic instances of concepts. We built an experimental protocol in order to evaluate the quality measures, on four corpora written in French and English. This work shows a large variation in the relevance of the terms, depending on the language and application field. This large variation is linked also to the grammatical tag of words making up the terms.
