When Socioterminology meets Textual Terminology: an inquiry into the notion of expertise. In this article, we propose to further reflections on the notion of expertise by investigating it from a terminological perspective. The first part focuses on the notion of expertise in socioterminology, a sociolinguistic approach to terminology. The second part deals with textual terminology. By presenting these two different ways of conceptualizing expertise, we aim to highlight how these two approaches diverge, but significantly, also complement one another. This complementarity enables us to develop an appropriate and innovative theoretical and methodological framework to meet the analytical needs of specific language practices in which the notion of expertise is key, thereby putting forward a proposition of a hybrid approach.