A recent episode of The Eric Andre Show, co-host Hannibal Buress closed the show by rapping as Laurence Fishburne's Matrix character. It turns out that there are a staggering number of words that kind of rhyme with "Morpheus."
Pity poor Orpheus, notorious son of Morpheus.
(I know. That's awful. I was trying to make it rhyme & theme it around Sandman (which was the first thing I thought of when I saw Morpheus, ahead of The Matrix) & got stuck. I'd be very impressed if someone can do a rhyming version of the story of Orpheus though)