Sentence:  Rather , it is typical of the thousands of <WSD>quacks</WSD> who use phony therapeutic devices to fatten themselves on the miseries of hundreds of thousands of Americans by robbing them of millions of dollars and luring them away from legitimate , ethical medical treatment of serious diseases . 
Meaning of the word marked with <WSD> tags:  an untrained person who pretends to be a physician and who dispenses medical advice