jester vs clown

jester and clown both are nouns.

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

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

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

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

jester (noun)	clown (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

jester (verb)	clown (verb)
	act as or like a clown