blunder vs fumble

blunder and fumble both are nouns.

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

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

As verbs, blunder and fumble are synonyms defined as:

blunder (noun)	fumble (noun)
an embarrassing mistake	(sports) dropping the ball

blunder (verb)	fumble (verb)
utter impulsively	drop or juggle or fail to play cleanly a grounder
make one's way clumsily or blindly	feel about uncertainly or blindly
commit a faux pas or a fault or make a serious mistake	handle clumsily
	make one's way clumsily or blindly
	make a mess of, destroy or ruin