A Game (N)

Let's have a game.
Here's what to do.
Write down a word,
I'll write one too.

I write my first word,
you can reply soon.
Words of a planet or
a word for the moon.

Be careful, make a choice,
picking the word, you choose.
There won't be a winner
and no one will lose.

Ready to play?
Then here goes.
What is beautiful,
but not called a Rose?

Remember to write,
just one word, at the end.
Use your imagination,
let's just pretend.
Turtle.