betray vs fool

betray is not a noun while fool is a noun.

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

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

betray (noun)	fool (noun)
	a person who lacks good judgment
	a person who is gullible and easy to take advantage of
	a professional clown employed to entertain a king or nobleman in the Middle Ages

betray (verb)	fool (verb)
give away information about somebody	indulge in horseplay
reveal unintentionally	fool or hoax
cause someone to believe an untruth	spend frivolously and unwisely
disappoint, prove undependable to; abandon, forsake	make a fool or dupe of
deliver to an enemy by treachery
be sexually unfaithful to one's partner in marriage