practical joker vs prankster

practical joker and prankster both are nouns.

Word	Noun	Adjective	Verb	Adverb
practical joker	Yes	No	No	No
prankster	Yes	No	No	No

As nouns, practical joker and prankster are synonyms defined as:

practical joker and prankster: someone who plays practical jokes on others

Other synonyms of practical joker include cut-up, hoaxer, tricker, trickster.

practical joker (noun)	prankster (noun)
someone who plays practical jokes on others	someone who plays practical jokes on others