Through a lexical analysis, this study examines the relationship between the terms used in various educational resources about robots. These resources were authored by novice or expert teachers in primary schools. Our hypothesis is that the computer science concepts discussed in an activity are different depending on the type of robot. The first results confirm dependence between the type of robot and the lexicon used in the resources. The corpus is explored according to three thematic sets of terms: Computer Science (CS), Pedagogy and Move with special attention for CS terms to compare the vocabulary used for sequential and event-driven programming robots.