Apparently, greed and greedy are weak words in poetry, so you can't use them, but what other words would you use?
The pirate greed for their gold.
And the adventurers are greedy
In their quests for adventures
Until an arrow in the knee they take.
I can't think of a way to reword this. It's like impossible, and I just think it's ridiculous to think of these two words as weak.