younker vs schoolchild

younker and schoolchild both are nouns.

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

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

younker: a young person (especially a young man or boy)
schoolchild: a young person attending school (up through senior high school)

Other hyponyms of younker include blade, hobbledehoy, pup, puppy, pupil, school-age child, slip.

younker (noun)	schoolchild (noun)
a young person (especially a young man or boy)	a young person attending school (up through senior high school)