practical joke vs prank

practical joke and prank both are nouns.

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

As nouns, prank is a hypernym of practical joke; that is, prank is a word with a broader meaning than practical joke:

practical joke: a prank or trick played on a person (especially one intended to make the victim appear foolish)
prank: a ludicrous or grotesque act done for fun and amusement

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

practical joke (noun)	prank (noun)
a prank or trick played on a person (especially one intended to make the victim appear foolish)	a ludicrous or grotesque act done for fun and amusement
	acting like a clown or buffoon

practical joke (verb)	prank (verb)
	dress up showily
	dress or decorate showily or gaudily