Dear god in heaven... 😂 On one of the recent episodes of 8 out of 10 Cats does Countdown, Sean Locke (filmed before he died last year, natch) described an Impossible Dictionary, where you looked up words based on their 4th letter--but it was the fourth *unique* letter; and words like donut are found under "e" for "baked goods", and other impossible rules. It was hysterically complicated.
But then we have here, How to use a Japanese Dictionary:
https://www.tofugu.com/japanese/how-to-use-a-kanji-dictionary/
I have no words. 🤣