boarder vs pupil

boarder and pupil both are nouns.

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

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

Other hypernyms of boarder include school-age child, schoolchild.

boarder (noun)	pupil (noun)
a tenant in someone's house	the contractile aperture in the center of the iris of the eye; resembles a large black dot
a pupil who lives at school during term time	a learner who is enrolled in an educational institution
someone who forces their way aboard ship	a young person attending school (up through senior high school)