The aim of this paper is to evaluate the importance of semantic relations between words for the structure of a field. In order to do this, three notions 'lexical grouping', lexical field' and 'lexical net' are introduced. Each one of them can be seen as a candidate for the intuitive idea of lexical field. The three notions differ with respect to the weight they put on semantic relations between words as part of their semantic structure. Several relations between the three notions are investigated. This leads to the conclusion that a notion which employs dimensions as well as semantic relations is best for capturing the ground which intuitively a notion of lexical field should cover.
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