pupil vs medico

pupil and medico both are nouns.

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

As nouns, medico is a hyponym of pupil; that is, medico is a word with a more specific, narrower meaning than pupil:

pupil (noun)	medico (noun)
the contractile aperture in the center of the iris of the eye; resembles a large black dot	a licensed medical practitioner
a learner who is enrolled in an educational institution	a student in medical school
a young person attending school (up through senior high school)