scholium vs marginalia

scholium and marginalia both are nouns.

Word	Noun	Adjective	Verb	Adverb
scholium	Yes	No	No	No
marginalia	Yes	No	No	No

As nouns, marginalia is a hypernym of scholium; that is, marginalia is a word with a broader meaning than scholium:

scholium: a marginal note written by a scholiast (a commentator on ancient or classical literature)
marginalia: notes written in the margin

scholium (noun)	marginalia (noun)
a marginal note written by a scholiast (a commentator on ancient or classical literature)	notes written in the margin