boo-boo vs fumble

boo-boo and fumble both are nouns.

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

As nouns, fumble is a hyponym of boo-boo; that is, fumble is a word with a more specific, narrower meaning than boo-boo:

boo-boo (noun)	fumble (noun)
an embarrassing mistake	(sports) dropping the ball

boo-boo (verb)	fumble (verb)
	drop or juggle or fail to play cleanly a grounder
	feel about uncertainly or blindly
	handle clumsily
	make one's way clumsily or blindly
	make a mess of, destroy or ruin