bumble vs fumble

bumble is not a noun while fumble is a noun.

Word	Noun	Adjective	Verb	Adverb
bumble	No	No	Yes	No
fumble	Yes	No	Yes	No

As verbs, bumble and fumble are synonyms defined as:

bumble (noun)	fumble (noun)
	(sports) dropping the ball

bumble (verb)	fumble (verb)
speak haltingly	drop or juggle or fail to play cleanly a grounder
walk unsteadily, tripping repeatedly	feel about uncertainly or blindly
make a mess of, destroy or ruin	handle clumsily
	make one's way clumsily or blindly
	make a mess of, destroy or ruin