valedictory speaker vs scholar

valedictory speaker and scholar both are nouns.

Word	Noun	Adjective	Verb	Adverb
valedictory speaker	Yes	No	No	No
scholar	Yes	No	No	No

As nouns, scholar is a hypernym of valedictory speaker; that is, scholar is a word with a broader meaning than valedictory speaker:

valedictory speaker: the student with the best grades who usually delivers the valedictory address at commencement
scholar: a learned person; someone who by long study has gained mastery in one or more disciplines

Other hypernyms of valedictory speaker include bookman, scholarly person.

valedictory speaker (noun)	scholar (noun)
the student with the best grades who usually delivers the valedictory address at commencement	a learned person; someone who by long study has gained mastery in one or more disciplines
	someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs
	a student who holds a scholarship