savant vs bookman

savant and bookman both are nouns.

Word	Noun	Adjective	Verb	Adverb
savant	Yes	No	No	No
bookman	Yes	No	No	No

As nouns, bookman is a hypernym of savant; that is, bookman is a word with a broader meaning than savant:

savant: someone who has been admitted to membership in a scholarly field
bookman: a learned person; someone who by long study has gained mastery in one or more disciplines

Other hypernyms of savant include scholar, scholarly person.

savant (noun)	bookman (noun)
someone who has been admitted to membership in a scholarly field	a learned person; someone who by long study has gained mastery in one or more disciplines