muff vs blunder

muff and blunder both are nouns.

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

As nouns, blunder is a hypernym of muff; that is, blunder is a word with a broader meaning than muff:

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

muff (noun)	blunder (noun)
(sports) dropping the ball	an embarrassing mistake
a warm tubular covering for the hands

muff (verb)	blunder (verb)
make a mess of, destroy or ruin	utter impulsively
fail to catch, as of a ball	make one's way clumsily or blindly
	commit a faux pas or a fault or make a serious mistake