Hi Weber,
1) You can add new role as a copy of ‘administrator’ role: Users->User Role Editor->Add Role->Make copy of: Administrator.
2) Revoke unneeded user capabilities, like “User Role Editor” group and capabilities related to unneeded plugin if it’s applicable to revoke them. You can look what capability protect what plugin menu items using “Admin menu access” add-on.
Btw., I don’t recommend to use any role ID, which included ‘administrator’ word. It may bring the mess to the WordPress UI and permissions processing, as due to a way how WordPress checks user permissions – as occurrence of the role ID to the string value. It’s better to use something like ‘admin_s’ instead.
