snafu vs foul-up

snafu and foul-up both are nouns.

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

As nouns, foul-up is a hypernym of snafu; that is, foul-up is a word with a broader meaning than snafu:

snafu: an acronym often used by soldiers in World War II: situation normal all fucked up
foul-up: an embarrassing mistake

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

snafu (noun)	foul-up (noun)
an acronym often used by soldiers in World War II: situation normal all fucked up	an embarrassing mistake

snafu (adjective)	foul-up (adjective)
snarled or stalled in complete confusion

snafu (verb)	foul-up (verb)
cause to be in a state of complete confusion