joke vs prank

joke and prank both are nouns.

Word	Noun	Adjective	Verb	Adverb
joke	Yes	No	Yes	No
prank	Yes	No	Yes	No

As nouns, joke and prank are synonyms defined as:

Other synonyms of joke include antic, caper, put-on, trick.

joke (noun)	prank (noun)
a ludicrous or grotesque act done for fun and amusement	a ludicrous or grotesque act done for fun and amusement
activity characterized by good humor	acting like a clown or buffoon
a triviality not to be taken seriously
a humorous anecdote or remark intended to provoke laughter

joke (verb)	prank (verb)
act in a funny or teasing way	dress up showily
tell a joke; speak humorously	dress or decorate showily or gaudily