Revoked means people who we have revoked from the whitelist so they no longer have building rights. They are later blacklisted so they can't apply for building rights again.
We do this to people who have griefed to prevent further damage. Players that are blacklisted are still able to log on to our server but without the ability to destroy anything, but only the ability to watch constructions and chat with other players. In a few cases we give players a last chance.
Banning is when we completely block the permission for players to join at all. For example speedhackers or players who can't keep a respectful tone.
Hope this clarifies the difference of us banning and blacklisting someone.