The traditional Chinese character of Yin is Yin, and this word is a compound word.
Let's start with the lotus on the left. This word is the radical of the word "Fu", which means mountains, especially tall earth mountains without stones. Erya Dish was written in mainland China. There are no stones on Shuowen Mountain. "Shi Ming" is everywhere, with high and thick words. Xiaoya is like a mountain.
Followed by the word on the right, this word is a pictophonetic word, and this word on it is pronunciation; The word cloud is below, next to the shape. This word means a cloud that doesn't rain.
Then this shadow means that thick clouds cover the hills and the weather is gloomy. Explaining words with words, Yin is darkness, which means darkness.
Then let's talk about the word yin. Traditional Chinese characters are yin.
This word is a pictophonetic word, phonetically speaking. The first is grass, and the other is brick, which means the way plants are born. Generally speaking, it refers to plants with soft stems.
Then the word "yin sound" means that the word "yin" originally only refers to the shade formed by soft grass, but it soon extends to the shade formed by tall trees, such as in Xunzi Persuasion, where trees are shaded and birds are resting. As for the meaning of shade, it is a simplified form of the word, not here.
So according to the above analysis, we can draw the following conclusions.
1 The original part of speech of Yin is a noun; The original meaning of yin is also a noun.
The word "shadow" has few extended meanings, and basically refers to the shadow caused by trees; Yin characters have many extended meanings, especially some dark and sinister meanings.
3 words such as shade, considering that these shadows are all formed by trees, it is better to use the word shade.
PS: I also read an article on the Internet, pointing out that although these two words are stipulated in the audition form, they are rarely implemented.