This chapter provides an overview of the study of competition in word-formation theories, drawing on the findings of the ten chapters collected in this volume and other recent contributions. It explores recurrent issues regarding (i) the triggers and outcomes of competition, (ii) the variety of competing forms, and (iii) the synonymy condition for competition. With respect to the first set of research questions, a binary typology of form-based and meaning-based resolutions is identified, with each pole providing multiple ways to resolve competition. Next, for the form-related research questions, the distinction between macro‑ and micro-level competition is significant. Finally, the synonymy condition is reassessed through a careful comparison between morphologically simplex and complex lexemes, leading to a definition of competing rivals in word-formation as a set of formally suppletive morphological processes that produce propositional, near, or sense synonyms.