The aim of this paper is to analyze the interrelationship and interdependence between morphological variation and text types by analyzing Spanish items finished in one of the allomorphs -tad y-dad, -icia, -eza and -ez, and -tud and -dumbre, in four different text types from the 15 th century. Therefore, we have created a corpus of neological units with documentation in the Diccionario del castellano del siglo XV de la Corona de Aragón. We have analyzed, in a next step, the neologisms from both

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... semantic and morphological perspective, highlighting, in particular, cases of morphological competition between these and other morphemes. At all times, we have taken into account the text types in which the neological itmes are documented: legal and administrative texts, scientific, technical and doctrinal texts, historical texts; and romantic and poetic texts. We've highlighted, in the analysis, the higher productivity and stability of lexemes finished in -dad, the exclusive presence of a large number of terms in scientific, technical and doctrinal texts and the morphological variation between the inherited morphemes.