中 Zhōng is 'middle'


Example: 中国 Zhōngguó 'Middle Kingdom, China'

钟 Zhōng 'bell'


Example: 三点钟 sān diǎn zhōng '3 o'clock'
The traditional character is: 鐘

种 Zhǒng is 'sort'


Example: 种类 zhǒnglèi 'sort'
This character is also read zhòng 'to plant'.
The traditional character is: 種