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Adjective quack has 1 sense
  1. quack - medically unqualified; "a quack doctor"
    Antonym:     qualified (indirect, via unqualified)
,Noun quack has 2 senses
  1. quack - an untrained person who pretends to be a physician and who dispenses medical advice
    --1 is a kind of     doctor, doc, physician, MD, Dr., medico; mountebank, charlatan
    Derived form: verb quack2
  2. quack - the harsh sound of a duck
    --2 is a kind of     sound
    Derived form: verb quack1
,Verb quack has 2 senses
  1. quack - utter quacking noises; "The ducks quacked"
    --1 is one way to     utter, emit, let out, let loose
    Derived form: noun quack2
    Sample sentence:
    Something ----s
  2. quack - act as a medical quack or a charlatan
    --2 is one way to     act, behave, do
    Derived forms: noun quack1, noun quackery1
    Sample sentence:
    Somebody ----s
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