May I know is it possible to create a event for a text in tkinter text widget?
Example, I click on a word on text box, and a small window will pop out and give a brief defin
Yes, it is possible. You can add a tag to a word or text region using the tag_add function, then use the tag_bind method (with a event) to make the text "clickable".
You can create a new TopLevel widget to pop up a new window in the callback function.