boarder vs schoolchild

boarder and schoolchild both are nouns.

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

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

boarder: a pupil who lives at school during term time
schoolchild: a young person attending school (up through senior high school)

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

boarder (noun)	schoolchild (noun)
a tenant in someone's house	a young person attending school (up through senior high school)
a pupil who lives at school during term time
someone who forces their way aboard ship