I had a question about not finding the address of a node in Nominatim: https://lists.openstreetmap.org/pipermail/talk/2020-August/085428.html
So the addr:street tag on the node is Ringvegen but the name tag on the street is Ringveien. Because these do not match, Nominatim attaches another street to the address and it can not be found under Ringvegen.
Ringvegen seems to be the correct usage. Why is the street called Ringveien and can this be changed to Ringvegen?
Address nodes are continuously imported from an official source - street names are not. Therefore the address node is almost always right. When in doubt, go to norgeskart.no to check.