You can implement your own dictionary containing the words of the original one. The implementation is relatively simple, assuming you have the proper .tdf file added as 'Resource':
Stream stream = Application.GetResourceStream(
You can find attached the original tdf file for US English, and further modify it, for example using the tool from Creating a Custom RadSpell Dictionary
blogpost (this is from the UI for ASP.NET AJAX Forum, but the format is the same).
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