betray vs let out

betray and let out both are verbs.

Word	Noun	Adjective	Verb	Adverb
betray	No	No	Yes	No
let out	No	No	Yes	No

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

betray: reveal unintentionally
let 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

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

betray (verb)	let out (verb)
give away information about somebody	make (clothes) larger
reveal unintentionally	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
cause someone to believe an untruth	express audibly; utter sounds (not necessarily words)
disappoint, prove undependable to; abandon, forsake	bring out of a specific state
deliver to an enemy by treachery
be sexually unfaithful to one's partner in marriage