give away vs betray

give away and betray both are verbs.

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

As verbs, betray is a hyponym of give away; that is, betray is a word with a more specific, narrower meaning than give away:

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
betray: reveal unintentionally

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

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

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