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When foreign students learn Japanese words, they encounter two types of problems. The first is the difficulty of the word itself. The second problem is related to the situation which it is used. The m...eaning of the word may differ as the situation changes. It is necessary to understand the ambiguity of the word. In this paper, we propose three simple formulas representing ambiguity of words based on Synset structure in Japanese WordNet. Then we analyze the relationship between the ambiguity and the difficulty of Japanese words, particularly verbs. We use vocabulary level of Japanese-Language Proficiency Test (old version) as the difficulty measure. The result shows that easy (not difficult) words are more ambiguous than difficult words.続きを見る
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