You can host more than one Parked or Addon domain names.
Parked domains are secondary names of the main domain name. They point to the exact same page as the main domain name of the website. This feature is offered in all web hosting solutions except the Small hosting plan.
Addon domains give you the opportunity to have a completely seperate website under the same web hosting package. When you create an addon domain a subdirectory is automatically created in /public_html directory where you upload the content of your website. So you can host 2 seperate websites under the same account.
This feature is available from Advanced hosting plan.