Users are familiar with &action=delete which has been called as 'Delete' for a long time.
When the new RevisionDelete system comes, users may get confused because of the name. Names used currently include:
'delete' - special page name, many messages
'remove' - log entries
'hide' - index.php parameters, right names
'suppress' - right names
'oversight' - old name in that extension (not used now?)
We should find a consistent name for this new feature.