schoolboy vs boy

schoolboy and boy both are nouns.

Word	Noun	Adjective	Verb	Adverb
schoolboy	Yes	No	No	No
boy	Yes	No	No	No

As nouns, boy is a hypernym of schoolboy; that is, boy is a word with a broader meaning than schoolboy:

Other hypernyms of schoolboy include male child, adult male, man, pupil, school-age child, schoolchild.

schoolboy (noun)	boy (noun)
a boy attending school	a youthful male person
	(ethnic slur) offensive and disparaging term for Black man
	a friendly informal reference to a grown man
	a male human offspring