Arabist vs bookman

Arabist and bookman both are nouns.

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

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

Arabist: a scholar who specializes in Arab languages and culture
bookman: a learned person; someone who by long study has gained mastery in one or more disciplines

Other hypernyms of Arabist include scholar, scholarly person.

Arabist (noun)	bookman (noun)
a scholar who specializes in Arab languages and culture	a learned person; someone who by long study has gained mastery in one or more disciplines