Ah, right, I see. I guess I felt the same way about "Realm". In a way, that term is also generic and could mean anything, hence the article where it has to be explained to people.
But, this is a common problem with most terms.
It's like naming your website or company. You want to use a name with words that everyone recognizes and can all immediately identify with.
Same goes for spelling. "WebWorx" for example. You don't want to be having to spell it out to people every time, or have people miss your website because they typed "webworks.com" instead of "webworx.com" -- BTW, that is just an example, I don't think that website actually exists.