different between quackery vs mountebankery

English

quack +? -ery

quackery (countable and uncountable, plural quackeries)

(law, medicine, uncountable) The practice of fraudulent medicine, usually in order to make money or for ego gratification and power; health fraud.
(countable) An instance of practicing fraudulent medicine.

1772: Edmund Burke, ed, The Annual Register
His intentions were admirable, and his quackery had in view the public good; [...]

mountebank +? -ery

mountebankery (countable and uncountable, plural mountebankeries)

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