I would love to see this analysis without filters. Who is the rapper with the largest vocabulary? What does the distribution look like at the top? Surely Antipop Consortium or MF DOOM have larger vocabularies than Aesop for instance.
MF DOOM is on the list. He's above average, but well below Aes or most of Wu-Tang. I've listened to a fair number of rappers, and I was pretty confident Aes would be at the top of this list.
I agree it would be cool to see a list of all rappers, though. I was surprised not to see Del, and maybe there is some more obscure rapper I'm not thinking of with a broader vocabulary than Aes.