Who is the target audience? Someone familiar with nostr already or someone new to it? If the target audience audience is new people, I might not say domains, just because they'll confuse that with other web stuff. I might use something like aspects, components, features, etc.
Also, by these definitions would Amethyst be a super client and Primal be a client, where Primal, from what I can tell, only offers a social media feed component, where Amethyst has a marketplace, streams, etc.? Amethyst also has the ability to do groups. A lot of other clients/super clients do not. Is that a separate thing that would bump a client into super client status?
yep
I think these make sense to me. I like that the terminology is out there.