For all those who have made themselves comfortable with PuttY software, word selection by double clicking in xfce4-terminal would be difficult to get used to.

So they can follow these steps to use PuttY style word selection.

1. Right click anywhere inside xfce4-terminal and select Preferences
   
   
2. Select the Advanced tab
   
   
3. Paste the following text in the box below "Double Click" section

-A-Za-z0-9./?_~

That's it. Enjoy PuttY style word selection on xfce4-terminal :)