Registering a domain name and hosting one is frequently mistaken by a lot of people to be the same thing. These are in reality two different services - the domain registration is the actual name and nothing more, while the hosted domains feature refers to the amount of already registered domain addresses which you can accommodate within the same hosting account and have site data and emails for them. Your websites will work in exactly the same way regardless of whether the domain names are registered and hosted at the same place or are registered with company A and directed to company B. Simply registering a domain name without hosting it will grant you ownership, but will not allow you to have a web site if you don't host this domain name in some account so that records for it are set up and it starts opening the content from that account.