jest vs fool

jest and fool both are nouns.

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

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

Other hyponyms of jest include gag, quip, arse around, fool around, horse around, pun.

jest (noun)	fool (noun)
activity characterized by good humor	a person who lacks good judgment
a humorous anecdote or remark intended to provoke laughter	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

jest (verb)	fool (verb)
act in a funny or teasing way	indulge in horseplay
tell a joke; speak humorously	fool or hoax
	spend frivolously and unwisely
	make a fool or dupe of