There are no Western Romance Languages.
Western Romance languages are one of the two subdivisions of a proposed subdivision of the Romance languages based on the La Spezia -- Rimini line . The subdivision is based solely on the use of the `` s '' for pluralization and the weakening of some consonants , but that makes the categorization highly problematic because there is much higher lexical similarity between all dialects of Italian and French than between French and Spanish . Based on mutual intelligibility , Dalby counts a dozen languages : Portuguese , Spanish , Asturian-Leonese , Aragonese , Catalan , Gascon , Provençal , Gallo-Wallon , French , Franco-Provençal , Romansh , and Ladin .