quack vs medico

quack and medico both are nouns.

Word	Noun	Adjective	Verb	Adverb
quack	Yes	Yes	Yes	No
medico	Yes	No	No	No

As nouns, medico is a hypernym of quack; that is, medico is a word with a broader meaning than quack:

quack: an untrained person who pretends to be a physician and who dispenses medical advice
medico: a licensed medical practitioner

Other hypernyms of quack include doc, doctor, Dr., MD, physician, charlatan, mountebank.

quack (noun)	medico (noun)
the harsh sound of a duck	a licensed medical practitioner
an untrained person who pretends to be a physician and who dispenses medical advice	a student in medical school

quack (adjective)	medico (adjective)
medically unqualified

quack (verb)	medico (verb)
act as a medical quack or a charlatan
utter quacking noises