Instead of having the words become "bad" I would advise you make it say "[censored]" because otherwise it may confuse.
Also, you can just preview to test if the word filter works. I found that it does filter out some words, but there are some common ones which you have forgotten to include. There's also something one has to watch out for, and that is when certain words contain the specified word and you end up censoring part of an innocent word.
