「辞書」 (jisho) means "dictionary." It's a book or electronic resource that lists words of a language in alphabetical order, giving their meanings and usage. You use it to look up words. Example: 辞書で言葉を調べます。 (I look up words in a dictionary.)
「辞書」は、言葉の意味を調べる本です。知らない言葉を調べます。例:辞書を買います。
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