My question is with relation to terms used to describe the value or worth of domain names.

The one most common is 'premium' or 'premium domain names'

I guess that the ones which are not premium, are known as plain, and are there any others.

Would there perhaps be the term 'super premium'?

Are there any others which are official, or others which can be used as a matter of opinion.

Please go all out on this one.

What do you exactly mean?
You mean value of your website in i.e domain pricing websites?

just the half wits who have this idea that having the "right" name is an instant pathway to riches.

Maybe google wouldn't have done so well if they called themselves, erm, yahoo perhaps, of course if I had bought easysearch.com 11 years ago I would be richer than google and yahoo combined, probably.....

Originally Posted by chrishirst

just the half wits who have this idea that having the "right" name is an instant pathway to riches.

Yes, that is one way to define it.

They are premium domain names or not premium domain names only because someone believes or not believes in them as in premium domain names.
That is simple.