Rappist

Anyone who creates or performs artistically superior street poetry, on a professional level

The way that some of these artists "rap" stands out from other's in the way that they artfuly piece together their rhymes to form a picture or convey a message in such a manner that, regardless of the subject matter, is really quite beautiful and very professionally done. Much like there are dentists, and scientists, bassists, guitarists, soloists, there are also rappists.