Find what word is selected by mouse in GUI.Label

So I need to find what word is selected by the user in either a GUI Label 3d text etc.

I don't think a label has this functionality so that is out of the question. 3d text, maybe, I don't really know, thats for you to find out;) Maybe stringing buttons together. Not sure how to do this though. Also, I would like the word wrap functionality as well.

I know I am asking a lot but you don't have to do this. Thanks in advanced as usual

-S