For this one, I had to write a crapton of synonyms or words you could associate with the ocean, and then build a poem off of it. you cannot use the word ocean, though. Done in less than five minutes.

To give you all an example of how to do this, let's make a poem right here in the description! :D
First, we'll choose the word: Pencil

Then, create a couple of lines with synonymous words:

Graphite
Lead
Writing
Paper

And now, we build lines off of these words, without using the word 'pencil'

Ye who writes in graphite,
No longer in the poisonous led,
Allow me to express that which is in my head through writing;
Paper as my outlet.