You can add domain names to any type of hosting account.
However, what you can do with additional domain names depends on the type of hosting account you have. For more information, see What type of hosting account do I have?
Available with Deluxe, Premium, Unlimited, and Ultimate accounts.
While we offer unlimited secondary domains on our Deluxe, Premium, Unlimited, and Ultimate shared hosting accounts, we do not recommend using shared hosting for more than ten websites. Doing so taxes the server resources and hinders performance.
See full entry here: www.uk.godaddy.com/help/add-domains-8342