Pronounciation may be the difference. In English, all the written letters are pronounced, whereas some letters though written are not pronounced in French.
Here's one for 5.99 http://www.amazon.com/Merriam-Websters-French-English-Dictionary-Inc-Merriam-Webster/dp/0877799172/ref=sr_1_1?ie=UTF8&qid=1269496531&sr=8-1-spell But you can simply google...