Synonyms for Slaver (same or very similar meaning)
WordNet sense 1 (a person engaged in slave trade):
slave dealer, slave traderWordNet sense 2 (someone who owns slaves):
slaveholder, slave ownerWordNet sense 3 (let saliva drivel from the mouth):
dribble, drivel, drool, slobber, slabberFrom the ODE community, based on WordNetadd/edit