stumble vs pratfall

stumble and pratfall both are nouns.

Word	Noun	Adjective	Verb	Adverb
stumble	Yes	No	Yes	No
pratfall	Yes	No	No	No

As nouns, pratfall is a hypernym of stumble; that is, pratfall is a word with a broader meaning than stumble:

Other hypernyms of stumble include bloomer, blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup.

stumble (noun)	pratfall (noun)
an unsteady uneven gait	an embarrassing mistake
an unintentional but embarrassing blunder	a fall onto your buttocks

stumble (verb)	pratfall (verb)
make an error
miss a step and fall or nearly fall
walk unsteadily, tripping repeatedly
encounter by chance