jester vs buffoon

jester and buffoon both are nouns.

Word	Noun	Adjective	Verb	Adverb
jester	Yes	No	No	No
buffoon	Yes	No	No	No

As nouns, buffoon is a hypernym of jester; that is, buffoon is a word with a broader meaning than jester:

jester: a professional clown employed to entertain a king or nobleman in the Middle Ages
buffoon: a person who amuses others by ridiculous behavior

Other hypernyms of jester include clown, goof, goofball, merry andrew.

jester (noun)	buffoon (noun)
a professional clown employed to entertain a king or nobleman in the Middle Ages	a person who amuses others by ridiculous behavior
	a rude or vulgar fool