misstep vs boo-boo

misstep and boo-boo both are nouns.

Word	Noun	Adjective	Verb	Adverb
misstep	Yes	No	No	No
boo-boo	Yes	No	No	No

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

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

misstep (noun)	boo-boo (noun)
an unintentional but embarrassing blunder	an embarrassing mistake