come out vs expose

come out is not a noun while expose is a noun.

Word	Noun	Adjective	Verb	Adverb
come out	No	No	Yes	No
expose	Yes	No	Yes	No

As verbs, expose is a hypernym of come out; that is, expose is a word with a broader meaning than come out:

come out: to state openly and publicly one's homosexuality
expose: make known to the public information that was previously known only to a few people or that was meant to be kept a secret

Other hypernyms of come out include break, bring out, disclose, discover, divulge, give away, let on, let out, reveal, uncover, unwrap.

come out (noun)	expose (noun)
	the exposure of an impostor or a fraud

come out (verb)	expose (verb)
appear or become visible; make a showing	abandon by leaving out in the open air
be issued or published	expose while ridiculing; especially of pretentious or false claims and ideas
break out	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
come out of	put in a dangerous, disadvantageous, or difficult position
take a place in a competition; often followed by an ordinal	remove all or part of one's clothes to show one's body
be made known; be disclosed or revealed	to show, make visible or apparent
to state openly and publicly one's homosexuality	expose to light, of photographic film
bulge outward	expose or make accessible to some action or influence
make oneself visible; take action	reveal to view as by removing a cover
drop out
result or end