The aim of this paper is to delimit the category nombre within Mocovi grammar. It is our interest to discuss nominal semantics, based on grammatical class delimitation. To do so, we focus on the morphological features of the names and on nominalizations. We also propose an analysis on the behavior of this category in interface with syntax and morphology. Regarding methodology, data taken from Mocovi branches from Chaco and Santa Fe were analyzed. Available basic systematic bibliography about the language was also taken into account. This sample was completed with free and oral texts, gathered by direct and contextualized elicitation, by means of image projection. Although it was noticed that the category 'name' shares common features with adjectives and verbs of the language, singular morphosyntactic properties were recognized as to label it as a differentiated category. It was also possible to be recognized that Mocovi possesses purely syntactic features, which allow the productive creation of complex names. In addition to this, semantic features associated to different nominalization suffixes such as location, vegetal semantics, eventiveness, result, instrument and agency were identified.