betray vs give away

betray and give away both are verbs.

Word	Noun	Adjective	Verb	Adverb
betray	No	No	Yes	No
give away	No	No	Yes	No

As verbs, betray and give away are synonyms defined as:

Other synonyms of betray include denounce, grass, rat, shit, shop, snitch, stag, tell on.

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

betray: reveal unintentionally
give away: 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, let on, let out, reveal, uncover, unwrap.

betray (verb)	give away (verb)
give away information about somebody	make known to the public information that was previously known only to a few people or that was meant to be kept a secret
reveal unintentionally	give away information about somebody
cause someone to believe an untruth	make a gift of
disappoint, prove undependable to; abandon, forsake	formally hand over to the bridegroom in marriage; of a bride by her father
deliver to an enemy by treachery
be sexually unfaithful to one's partner in marriage