Problem:  Some bad words are part of another word, which make them hard to impossible to block.  For example, in many bad word filters you cannot ban the world hell because it would also ban the word hello, because it contains the characters hell.

 

Solution: When you add the bad word to the bad word filter, press the space bar immediately after the bad word.  This will store the bad word plus a space in the database (i.e.  store it as "hell " instead of "hell").  When the bad word filter finds "hell " in the post, it replaces it, but hello is safe since there is no space immediately after hell.  You may also want to add "hell." and "hell," as well to make sure you get as many variations as possible.  

 

The only place where you can't block the word is if they pressed the enter key after typing it.  But, even so, before you knew about this trick, you couldn't block it at all!

 

Hope that helps and gives you some ideas on how to block hard to block bad words.