9. The method of claim 8 wherein the step of matching phonemes of the word to phonemes of the classified words includes matching the first four phonemes of the word to the first four phonemes of the classified words.
8. A method of assigning a pre-filtering class to a word when adding a word to a speech recognition dictionary, the method comprising: matching first two letters of the word to classified words starting with the same two letters to form a sub-list of classified words, matching phonemes of the word to phonemes of the classified words in the sub-list to form a class list, and placing the word in the class list.