prank vs joke

prank and joke both are nouns.

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

As nouns, prank and joke are synonyms defined as:

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

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

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