Synonyms for quack

modified

noun

quack and charlatan both apply to a person who unscrupulously pretends to knowledge or skill he or she does not possess, but quack almost always is used of a fraudulent or incompetent practitioner of medicine; mountebank, in modern use, suggests a self-promoting person who resorts to cheap methods or trickery in his or her work, etc.; impostor applies esp. to a person who fraudulently assumes the identity or character of another; fake is a colloquial term for a person who practices deception or misrepresentation