As of now, the only words I have found that aren't filtered are the combination o "O+shizzle". You can replace the letter O with any other letter just as long as it is one word and it won't get censored. That is one of the words I got a warn for because I thought it would have got censored.
Another one is "nice doggy!+in'". For some reason it will censor "nice doggy!+ing" but not "nice doggy!+in'".
So.. Some sites have it made where you can have a variable for the word like "*shizzle" and the asterisk represents any letter. So a word like "O+shizzle" would be censored. Same goes for "nice doggy!*" for "nice doggy! + in'".
Hope that made sense.
