Do you by any chance have the names of ANY of them? I tried searching:

• filter
• profanity
• profanity filter
• swear filter
• bad language
• swear
• input

nevermind I found it by searching for "word" ... the one I found is called Big Brother and it is located here: http://community.elgg.org/pg/plugins/project/384694/developer/brett.profitt/big-brother

 (incase anyone else comes across this discussion looking for the same thing as I was)

Also, for reference for anyone looking to hook input you an use the following to hook all create and update commands:

register_elgg_event_handler('create', 'all', 'bigbrother_filter_entity');

register_elgg_event_handler('update', 'all', 'bigbrother_filter_entity');

You can see full details of it in action in the big brother module I posted above