can I forbid some nicknames

I would like to forbid for new users to register on the forum under some nicknames.
Can I do this, and how??

Yes you can, ACP- general-username censoring

Users Censoring
From this control panel you can add, modify, and remove forbidden usernames.

New usernames won’t be allowed to contain this words.
For example, if "test" is forbidden, no name created after the addition of this censored word will contain "test". So "test", "test06", "fastest" and "fatest98" will be forbidden.

thank U

you are welcome