faux pas vs boo-boo

faux pas and boo-boo both are nouns.

Word	Noun	Adjective	Verb	Adverb
faux pas	Yes	No	No	No
boo-boo	Yes	No	No	No

As nouns, boo-boo is a hypernym of faux pas; that is, boo-boo is a word with a broader meaning than faux pas:

Other hypernyms of faux pas include bloomer, blooper, blunder, boner, botch, bungle, flub, foul-up, fuckup, pratfall.

faux pas (noun)	boo-boo (noun)
a socially awkward or tactless act	an embarrassing mistake