day boarder vs pupil

day boarder and pupil both are nouns.

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

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

day boarder: a schoolchild at a boarding school who has meals at school but sleeps at home
pupil: a young person attending school (up through senior high school)

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

day boarder (noun)	pupil (noun)
a schoolchild at a boarding school who has meals at school but sleeps at home	the contractile aperture in the center of the iris of the eye; resembles a large black dot
	a learner who is enrolled in an educational institution
	a young person attending school (up through senior high school)