@mageshkumarj I'm double checking on the possibility of this. I don't think it is possible, but I am not 100% sure.
However, if it is possible, I would caution against it. If the rule is looking for a specific word or words, what happens when a user misspells the word? The rule won't work. Also, users could learn to purposely misspell the word to avoid the rule.
I'll let you know what my colleague says though.
@mageshkumarj My colleague says it is possible to create an audit rule based on a key word. You would just need to make sure you enter conditions for each possible misspelling of the word.