Top 6 most difficult Japanese words to read

Back in the history, Japanese people have been so willing to import many cultures or products from foreign countries.
From very early time, Japan has kept importing cultures from China. China was such a developed neighbor at that time. They enlightened Japan about Buddhism, Mirrors and so on.
But among all, kanji culture was a best gift for Japan. By adopting kanji, Japanese people developed great poems and books. And they started to express everything using kanji even if the meaning of kanji itself is not related to the meaning of the word.
But soon, Japanese invented Hiragana and Katakana. Hiragana and katakana was invented based on characters written in running style.
Afterward people started to use Hiragana and katakana to express anything that are hard to express with kanji.

Japanese people started to use katakana to express something came from foreign countries.
For example, we write as カンガルー (kangaroo) now. But actually there is a kanji expression 更格廬 which also means kangaroo.

In this article I would like to introduce some of these difficult Japanese words to read.