In this paper, we consider the complementary between P. Cadiot 's constructivist approach and Construction Grammar. Several issues are discussed : the role of constructions in the profiling and the stabilizing of lexical motives (we study the example of the word verrou in the specificational construction) ; syntactic and semantic productivity ; consonance, that is to say the fact that a form is structured in an interconnected network of linguistic units participating in its elaboration and interpretation.