In Eberron, there are legalese words that have been part of Galifaran Common for hundreds of years, that mean fairly specific stuff. They are known in meaning to everyone on Khorvaire who speaks common, and are explained in full as part of arrests and before testimony is given in courts.
I don’t actually have real words bc I’m lazy, I just describe what the word means. They also aren’t really helpful in a fight. Stuff like “tell the judge everything you know about the case, honestly and thoroughly.” is very useful in a court, though.