how can i create an interactive text in GUI.Window?

hello,

I'm trying to create a window with some text in. A word in the text must be interactive (if the player click on the specific word, a new function is call). But I don't really know how to do it.

Help please... Thanks.

here my code :

     private Rect windowRect = new Rect(20, 200, 200, 200);
     public void OnMouseOver()
    {
     spriteRenderer.material.color = selectedColor;
     if (Input.GetMouseButtonDown(1))
     {
         isClicked = true;
     }
 }
 
 private void OnGUI()
 {
     if (isClicked == true)
     {
         windowRect = GUI.Window(0, windowRect, WindowFunction, "Crable City");
     }
 }

 private void WindowFunction (int windowId)
 {
     if (GUI.Button(new Rect(20, 20, 50, 50), "Close"))
     {
         isClicked = false;
     }
     StreamReader reader = new StreamReader("Assets/Text/Crable City.txt");

     GUI.DragWindow(new Rect(0, 0, Screen.width, Screen.height));
     GUI.Label(new Rect(5, 80, 200, 300), reader.ReadToEnd());

     int truc = GUI.skin.GetStyle("Label").GetCursorStringIndex(
     new Rect(5, 80, 200, 300), new GUIContent(reader.ReadToEnd()), Event.current.mousePosition);
 }