选择water，其它的都是疑问代词，water即可以做名词，也可以做动词，water，水，浇水；

how many多少，（问可数名词）；例句：How many pencils do you have？

who谁，（问人）例句：Who's your best friend?

where哪里，（问地点）；例句：Where's your favourite book？

water水，例句：I want to drink some water.

I don't know how to water the flowers.

不同类词是water

首先弄明白这些词的意思，分别是"多少、谁、哪里、水"，由此可见water是名词，而且是不可数名词，没有复数形式，而上面的词全部是疑问词，引导特殊疑问句

eg: How many books do you have?

你有多少本书？

eg: Who teaches you English?

谁教你英语?

eg: Where is my pen?

我的钢笔在哪里？