boner vs pratfall

boner and pratfall both are nouns.

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

As nouns, boner and pratfall are synonyms defined as:

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

boner (noun)	pratfall (noun)
an embarrassing mistake	an embarrassing mistake
	a fall onto your buttocks