But the Chinese meanings of these two words are the same, so these two words are written in the same Chinese character.

When learning Japanese, you must understand what "writing Japanese with Chinese characters" means.

Japanese has no words, only pseudonyms, which only indicate pronunciation and have no meaning. Therefore, if you want to reflect the written "shape", you must use Chinese characters.

For example, "やまま" is Japanese and "Shan" is written in Chinese characters, which means Japanese is written in Chinese characters.

And the Chinese character "Shan", when you read "さん" in Japanese, is to take the Chinese character completely and use it directly.