Seen multiple uses of 想 I've seen 想 mean 'thought' as well and wanted to know whether they're used interchangeably or not.


  我没想过这个问题。I've never thought about this question before.


And 想 is also used like this:


  你想不想我？Did you or did you not miss me?


So my book doesn't clarify WHY it's different. Why is 想 want, thought and miss? Some grammar to it? Are there more ways to use 想?
It's just very common for a word to have multiple meanings. An online dictionary gives the five interpretations:


思考, 动脑筋 to think, to consider


  让我想一想 = Let me think.

回忆 to remember


  我想不起来他昨天说了什么 = I can't remember what he said yesterday.

怀念, 惦记 to miss


  我想你 = I miss you.

希望, 打算 to hope/want to do something


  我想去旅游 = I want to travel.

预料, 推测 to anticipate, to predict


  我想这件事没表面上看起来那么简单 = I guess this is not as simple as it looks.