This plugin allows you to add blocked words per command ur manualy! You can adjust whether the word gets replaced with "*&#%" symbols or get blocked completely (whole message won't be allowed)
isb.* | permission for access to all features of the plugin
isb.info | to see the plugins' messages
isb.bypass | to bypass the blocking of the words
isb.manage.* | to have access to all manage-features of the plugin, contains the following permissions
isb.add | to add a word to the list
isb.delete | to delete a word from the list
isb.list | to get a full list with already added words
isb.setproperties | to change a property of a word
isb.reload | to reload the plugins' files
Put the .jar file in your servers' plugins folder and start / reload your server.