Wait till you learn that earth means the planet and also the ground
So you agree that Luna vs Terra is less clear than Haiku vs Sonnet?
I find Luna vs Terra more clear. I know what a haiku is only because it hss some sort of hype factor among certain crowds. But I have no idea what a sonnet is, I heard of the word but never seen or written one. Opus vaguely reminds me of something in Greek mythology but also no idea what that, let alone the apparent implication that it's supposed to be longer than a sonnet.
I'm not a big fan of poetry but I think it's bit depressing if you've never seen a sonnet or even heard of the concept.
Shall I compare thee to a summer’s day?
If you want to be pedantic, Earth is the planet and earth is ground/soil.