blunder vs breach

blunder and breach both are nouns.

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

As verbs, breach is a hypernym of blunder; that is, breach is a word with a broader meaning than blunder:

Other hypernyms of blunder include break, go against, infract, offend, transgress, violate.

blunder (noun)	breach (noun)
an embarrassing mistake	a failure to perform some promised act or obligation
	a personal or social separation (as between opposing factions)
	an opening (especially a gap in a dike or fortification)

blunder (verb)	breach (verb)
utter impulsively	make an opening or gap in
make one's way clumsily or blindly	act in disregard of laws, rules, contracts, or promises
commit a faux pas or a fault or make a serious mistake