quack

Từ điển WordNet v3.1 - WordNet Dictionary

I - noun

1. an untrained person who pretends to be a physician and who dispenses medical advice (Freq. 14)
• Hypernyms:
doctor, doc, physician, MD, Dr.,
medico, mountebank, charlatan
2. the harsh sound of a duck
• Hypernyms:
sound

II - verb

1. utter quacking noises (Freq. 1)
- The ducks quacked
• Hypernyms:
utter, emit, let out, let loose
• Verb Frames:
- Something ----s
2. act as a medical quack or a charlatan
• Derivationally related forms:
quackery
• Topics:
medicine, practice of medicine
• Hypernyms:
act, behave, do
• Verb Frames:
- Somebody ----s

III - adjective

medically unqualified (Freq. 4)
- a quack doctor
• Similar to:
unqualified