I was just reading my microeconomics book. I really hate the terminology economists use as much of it is counter-intuitive. So the book is describing a new term called a "market basket". They then off hand mention that some economists use the term "bundle" instead, and I think "Great! I'll use that instead. It doesn't sound as lame." So I continue reading trying to do real-time visual search and replace, and it's not easy. I've run into this problem before, but never tried that solution. Basically, it'd be great for an electronic book to let the user define word filters.