different between quackery vs quackish

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; [...]

quack +? -ish

quackish (comparative more quackish, superlative most quackish)

Like a quack (fraudulent doctor), or characteristic of quackery.
- 1827, Robert Pollok, The Course of Time
  The frothy orator, who busked his tales
  In quackish pomp of noisy words

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