Sentence:  Rather , it <WSD>is</WSD> typical of the thousands of quacks 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:  have the quality of being; (copula, used with an adjective or a predicate noun)