4369 words (meaning) of proverbs and facts, 3166 words (meaning / same synonyms) of four letters, 640 words (meaning) of three letters, 2040 words of difficult-to-read kanji (reading), and an overwhelming volume as a free application A simple learning dictionary containing content. When a proverb or idiom that you do not know in your daily life comes out, you can immediately find out the meaning. In addition, the “Four-word idioms” cover idioms corresponding to Hanken Level 2, Semi-Level 1 and Level 1. "Dictionary mode" and "Quiz mode" are prepared for each. In quiz mode, you can use it like a “reverse dictionary” or “writing practice” to know the words from meaning, and you can enjoy trivia knowledge when everyone gathers. It also has a bookmark registration function that is convenient for learning. Includes appendices such as Hundreds of People, Old Calendar Conversion, English Proverbs, Twenty Four Seasons, Seventy Two Seasons, Old Country Names / Prefectures Comparison Table, ABC Abbreviations, etc. * For those who feel that the advertisement display is in the way, we recommend the paid (99 yen) "Ad-free version".