illustrate vs exposit

illustrate and exposit both are verbs.

Word	Noun	Adjective	Verb	Adverb
illustrate	No	No	Yes	No
exposit	No	No	Yes	No

As verbs, exposit is a hypernym of illustrate; that is, exposit is a word with a broader meaning than illustrate:

illustrate: clarify by giving an example of
exposit: add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing

Other hypernyms of illustrate include dilate, elaborate, enlarge, expand, expatiate, expound, flesh out, lucubrate.

illustrate (verb)	exposit (verb)
clarify by giving an example of	state
depict with an illustration	add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
supply with illustrations