It's different from Zynga's "-ville", because Zynga creates new words that have never (or very rarely) been used. It's different from Apple's i-Things as well for the same reason. Both of those companies made prudent decisions about their brand trademarks by not treading on anyone else.

The law should not allow companies to own common English words in perpetuity. If you want to make your brand a common English word, you should accept the fact that other people get to use it.

I doubt King will win any lawsuits against others who use the words.