blunder vs mistake

blunder and mistake both are nouns.

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

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

blunder: an embarrassing mistake
mistake: a wrong action attributable to bad judgment or ignorance or inattention

Other hypernyms of blunder include error, fault.

blunder (noun)	mistake (noun)
an embarrassing mistake	a wrong action attributable to bad judgment or ignorance or inattention
	an understanding of something that is not correct
	part of a statement that is not correct

blunder (verb)	mistake (verb)
utter impulsively	to make a mistake or be incorrect
make one's way clumsily or blindly	identify incorrectly
commit a faux pas or a fault or make a serious mistake