[kh99]

If you add it to the list of censored words in the admincp, then in new posts it will be permanently replaced with ***s and you won't be able to show it to any other usergroup. (And that also applies to any posts already written while the word was censored). But what you could do is make a plugin (maybe on hook postbit_display_complete) to do your own censoring by str_replace() or something like that, then you could just check the user's usergroup to decide whether or not to do it.