valedictory speaker vs bookman

valedictory speaker and bookman both are nouns.

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

As nouns, bookman is a hypernym of valedictory speaker; that is, bookman 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
bookman: a learned person; someone who by long study has gained mastery in one or more disciplines

Other hypernyms of valedictory speaker include scholar, scholarly person.

valedictory speaker (noun)	bookman (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