let down vs betray

let down and betray both are verbs.

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

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

Other hyponyms of let down include fail, come short, fall short, disenchant, disillusion.

let down (verb)	betray (verb)
fail to meet the hopes or expectations of	give away information about somebody
move something or somebody to a lower position	reveal unintentionally
	cause someone to believe an untruth
	disappoint, prove undependable to; abandon, forsake
	deliver to an enemy by treachery
	be sexually unfaithful to one's partner in marriage