quack

definition: medically unqualified
example: That quack doctor should be arrested.
speech part: adjective
synonyms:
definition: the harsh sound of a duck
example: The duck's quack is ruining my mood.
speech part: noun
synonyms:
definition: an untrained person who pretends to be a physician and who dispenses medical advice or a charlatan in general
example: I don't trust quacks; I ask to see credentials.
speech part: noun
synonyms:
definition: to act as a medical quack or a charlatan
example: The imposter quacked all over town before they were caught.
speech part: verb
synonyms:
definition: to utter quacking noises
example: The ducks quacked all night long and I could not sleep.
speech part: verb
synonyms:

How quack is being used?