This link from Friend of GJAW Scott is superb.
The largest vocabulary in hip-hop.
I always thought Lil' Wayne was repetitive and boring, even in small doses. He needs more words.
DMX comes in dead last which makes sense if you have ever heard a DMX song. But he made up for it with the delivery. I'm sure some people feel the same way about Wayne or Young Jeezy or whatever his name is.