The present dissertation, based on subsidies from Corpus Linguistics consists of a study aimed at studying the lexicon of a literary work. We have chosen to analyze the book The Chronicles of Narnia: the Silver Chair (1953), by the writer C. S. Lewis, and its translations into the Portuguese language As Crônicas de Nárnia: a cadeira de prata – translated by Paulo Mendes Campos –, and into the Spanish language Las Crónicas de Narnia: la silla de plata – translated by María Rosa Duhart Silva. We have selected three words for analysis, which relate to the representation of the main female characters and the symbolic aspects of the narrative: Jill, Witch and owl. These are keywords in the corpus we compiled and they were extracted using specific tools from WordSmith Tools software. We then investigated the three words according to their co-text (text around the search word) and its context. To do so, we took into account the data provided by the program, such as the number of occurrences of the words chosen in the source text (ST) and in the target texts (TTs) and the theoretical assumptions of Corpus-based Translation Studies (BAKER, 1993, 1995, 1996). The results of the analyzes point to the creation of new meanings in the TTs according to the lexicon selected by the translators, leading the reader to conceptualize the characters mentioned in different ways, from their impressions upon access to the TT.