区别就是两者都是名词但意思是不一样的，具体的不同如下

debian中文意思是n. （Debian）通用操作系统

Do I need to be a Debian Developer?

arch中文意思是n. 拱门拱顶足弓拱形物

The arch once stood alone at the entrance to the castle.

They walked together through the arch and into the cobbled courtyard.