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This paper investigates a way of distinguishing synonyms with particular reference to the three Korean words ‘chaek’, ‘seojeok’ and ‘doseo’, all meaning (aspects of) “book”. The data are based on the TRENDS 21 corpus, a collection of daily newspapers. We get related words of a key word by co-occurrence (collocation) analysis. With networks of related words of synonyms, we can find features in common and differences among synonyms. After constructing the networks of related words of ‘chaek’, ‘seojeok’ and ‘doseo’, and comparing those three networks with each other, we found the following. ‘Chaek’ has high relevance with stories or unprofessional writings. ‘Seojeok’ is characteristically related to professional research. Finally, ‘doseo’ has two properties, one being the property as an object (entity, substance) for transaction and exchanging, the other being the property of having an educational function. The method in this research demonstrates validity of corpus linguistics in disclosing the differences of synonyms about which we do not have clear intuitions.
