The very substance of the indigenous narratives of Central America (1920-1970) has led us to analyze the regional linguistic idiosyncracies they contain, i.e. their formal constituents. The “screening” of some hundred literary works allowed us to create the first sizeable specific lexicon of this geographic area and of the “extended” period 1920-1990. Using a syntagmatic corpus (literary discourse or textual data), we built up a paradigmatic corpus of independent and reusable language units, with a clear descriptive, synthetic and didactic intention. Our purpose here is to offer the double methodological approach to our Dictionary of Central American Spanish whose actualized and bilingual Spanish-French version is now ready.