skipper vs pupil

skipper and pupil both are nouns.

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

As nouns, pupil is a hypernym of skipper; that is, pupil is a word with a broader meaning than skipper:

Other hypernyms of skipper include educatee, student.

skipper (noun)	pupil (noun)
the naval officer in command of a military ship	the contractile aperture in the center of the iris of the eye; resembles a large black dot
an officer who is licensed to command a merchant ship	a learner who is enrolled in an educational institution
a student who fails to attend classes	a young person attending school (up through senior high school)

skipper (verb)	pupil (verb)
work as the skipper on a vessel