exposition vs exposit

exposition is a noun but exposit is not a noun.

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

exposition (noun)	exposit (noun)
a systematic interpretation or explanation (usually written) of a specific topic
an account that sets forth the meaning or intent of a writing or discourse
(music) the section of a movement (especially in sonata form) where the major musical themes first occur
a collection of things (goods or works of art etc.) for public display

exposition (verb)	exposit (verb)
	state
	add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing