blunder vs foul-up

blunder and foul-up both are nouns.

Word	Noun	Adjective	Verb	Adverb
blunder	Yes	No	Yes	No
foul-up	Yes	No	No	No

As nouns, blunder and foul-up are synonyms defined as:

Other synonyms of blunder include bloomer, blooper, boner, boo-boo, botch, bungle, flub, fuckup, pratfall.

blunder (noun)	foul-up (noun)
an embarrassing mistake	an embarrassing mistake

blunder (verb)	foul-up (verb)
utter impulsively
make one's way clumsily or blindly
commit a faux pas or a fault or make a serious mistake