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This paper aims at revealing the semantic relation in new words formation, based on Choi(2018), by dividing it into two categories of ‘between words’ and ‘word inside’. Firstly for ‘between words’, if we focus on the new words only in the output, hyponymy is the most productive method. However, if we focus on the new words including input as well, antonymy is the most productive method. This means that antonymy has a property of filling the gap between lexemes. In contrast, synonymy is the most unproductive method. This shows that synonymy causes both economical inefficiency and redundancy of lexicon. These aspects are applied similarly to the semantic relation of ‘word inside’. Antonymy is the most productive method in new words formation. And synonymy and hyponymy are unproductive in new words formation. Synonymy just has an effect of emphasis and hyponymy leads to redundancy. In spite of these distinctions, it is hard to deny that semantic relation takes some sort of role in new words formation regardless of ‘between words’ and ‘word inside’.