DROP - Drop a registered nick.
INFO - Show info on a registered nick.
GETPASS - Show the password for a registered nick.
LIST - List nicknames that match a selected value.
MARK - Set a nickname so that it can't be getpassed or setpassed.
SETPASS - Set the password for a registered nick.
UNIDENTIFY - Make nickserv forget your identification to a nickname.
WIPE - Delete all access list entries for a registered nick.
Example:
/msg nickserv getpass Mark