The notions of governability and Populism have been used increasingly in political sciences papers on Latin America. The lack of precision in theirs meanings increased the same way. In this article, we argue that such difficulty lies in theirs uses in three ideal types of speech registries: the academic speech, the bureaucratic speech, and the political speech. We consider that these three uses of Populism and governability, with theirs respective logics, can generate much confusion. We propose therefore some reflections that try to clarify theses notions from the logic of the academic speech, but taking into account the uses that are made in both other registries of speeches.