[ubuntu] highlight uncommon word?

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http://ubuntuforums.org – I am learning a new language with Ubuntu. When I practise reading, usually I do a speed reading, guessing but not pausing on new words, and when I finish, come back to hunt these words. Marking them on the way is difficult, especially when I am studying movie subtitles, I cannot enjoy movie if I keep pausing it to mark new words. So I need a tool to highlight uncommon words in a text. The text can come from anywhere, and I would paste into the software that can do the highlighting. idea 1: install a very limited spell checker, with a vocabulary of a high-schooler (which is my vocabulary (Hardware)