I think such a feature would be very useful: If there is a cursor on a word, then the same words would be highlighted in red in the visible text, and, for example, other forms of these words would be yellow. I would like this feature to be very simple, and the backlight is always performed when the cursor is in the word, without having to press any buttons. This is done in MS Visual Studio and it is very convenient for programmers. I think this will help writers a lot too.