Alexie;
The Alias Plugin can let you create these as alias and another way is to use a case insensitive search to find all tiddlers containing each of the above.
However I advise the adoption of standard writing practices should not result in your need to do this. Another method is to always use this and use the uppercase , sentence case and title case to change the way it displays. HTML can also do this for you. Of course a real work example would not be some like the word this, more like google vs Google or Analysis/ANALYSIS if I am not correct.
Perhaps share a more compelling example.
Regards
Tony