betray vs expose

betray is not a noun while expose is a noun.

Word	Noun	Adjective	Verb	Adverb
betray	No	No	Yes	No
expose	Yes	No	Yes	No

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

betray: reveal unintentionally
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 betray include break, bring out, disclose, discover, divulge, give away, let on, let out, reveal, uncover, unwrap.

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

betray (verb)	expose (verb)
give away information about somebody	abandon by leaving out in the open air
reveal unintentionally	expose while ridiculing; especially of pretentious or false claims and ideas
cause someone to believe an untruth	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
disappoint, prove undependable to; abandon, forsake	put in a dangerous, disadvantageous, or difficult position
deliver to an enemy by treachery	remove all or part of one's clothes to show one's body
be sexually unfaithful to one's partner in marriage	to show, make visible or apparent
	expose to light, of photographic film
	expose or make accessible to some action or influence
	reveal to view as by removing a cover