quack

Noun
  1. An untrained person who pretends to be a physician and who dispenses medical advice (synset 110516787)
  2. The harsh sound of a duck (synset 107405362)
Adjective
  1. Medically unqualified (synset 301917970)
    "a quack doctor"
Verb
  1. Utter quacking noises (synset 201054970)
    "The ducks quacked"
  2. Act as a medical quack or a charlatan (synset 200011975)

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