pratfall vs boner

pratfall and boner both are nouns.

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

As nouns, pratfall and boner are synonyms defined as:

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

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