Tsktsks is the longest word that doesn’t contain a vowel. 12 and 13 Isograms are words that do not repeat letters. The longest examples are uncopyrightable and subdermatoglyphic.
Most of the listings here as the longest word in Japanese are simply ‘made up for fun’ kind of combinations of well-established words. You must understand if the connecting ‘particle’ ‘no’ is used in the combination, then it’s a combinations of nouns. One word has to be ‘inseparable’, therefore it is ‘one’ word.
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Feb 05, 2018 · In the ‘List of Frequently Used Modern Chinese Words (draft)’ published by the Commercial Press that compiles 56,064 words and idioms, the longest word in the manner above is 不管三七二十一 - adv. to cast all caution to the wind and act without thinking of the consequences 不管三七二十一 - Wiktionary; 浪子回头金不换 - It is rare when someone who has gone astray turns over a .