jokester vs joker

jokester and joker both are nouns.

Word	Noun	Adjective	Verb	Adverb
jokester	Yes	No	No	No
joker	Yes	No	No	No

As nouns, jokester and joker are synonyms defined as:

jokester (noun)	joker (noun)
a person who enjoys telling or playing jokes	a playing card that is usually printed with a picture of a jester
	an inconspicuous clause in a document or bill that affects its meaning in a way that is not immediately apparent
	a person who enjoys telling or playing jokes
	a person who does something thoughtless or annoying