Unlike DNS, GNS doesn't require that only one nick be bound to a domain to be resolved. [0] There's a series of preferences for the order of resolution, which means that you can prioritise your friend over someone else.

The domain itself can have a preference, but the user is free to ignore it. Which does mean that a domain is not as definitive as it is, in the case of DNS.

[0] https://lsd.gnunet.org/lsd0001/#name-nick-2