jester vs goofball

jester and goofball both are nouns.

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

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

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

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

jester (noun)	goofball (noun)
a professional clown employed to entertain a king or nobleman in the Middle Ages	a man who is a stupid incompetent fool
	a person who amuses others by ridiculous behavior