When God created the English language He very sensibly took several words and made them nearly unrhymable. He did this to stop bad poets going on about love, life and the world. Though you can make it to hurled, you then get stuck with curled and furled. You can’t even use whirled because Rhyming With A Homonym Is Cheating! As naughty David Bowie shouldn’t have sung in Starman:
I had to call someone so I picked on you.
Hey, that’s far out. So you heard him too.
Turn on the TV, we may pick him up on channel two.
World originally meant stuff people do or human life. It therefore got contrasted to Heaven, which is the next world. And from there it came to mean the little planet that the majority of us call home. Earth, which originally just meant soil (as opposed to, say, water), similarly got saddled with new meaning