I'm not sure if this is what you meant but there's a ton of word play in American Hip-Hop, it's pretty core to the genre. Literally any rapper you pick will be doing some amount of word play.
Sure I think MF DOOM is a good place to start especially his Madvillainy album with the producer Madlib which is really well regarded. More recent stuff I enjoy is Mick Jenkins from Chicago, his 2014 The Waters mixtape was also really well reviewed. Aesop Rock is also generally thought of as a really good technical rapper. His album None Shall Pass from the Def Jux days is really good though I prefer Skelethon which has less word play but is also brilliant.
If you have notable examples in mind, please do share with me because I have been trying to find that for a while to prove my own point wrong.