Search notes:
SQL Server: sp_helpsrvrole
sp_helpsrvrole lists the fixed server roles (except public which is internally not implemented as a role).
exec sp_helpsrvrole
ServerRole Description
----------------------------------- -----------------------------------
sysadmin System Administrators
securityadmin Security Administrators
serveradmin Server Administrators
setupadmin Setup Administrators
processadmin Process Administrators
diskadmin Disk Administrators
dbcreator Database Creators
bulkadmin Bulk Insert Administrators