gaffe vs pratfall

gaffe and pratfall both are nouns.

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

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

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

gaffe (noun)	pratfall (noun)
a socially awkward or tactless act	an embarrassing mistake
	a fall onto your buttocks