snafu vs flub

snafu and flub both are nouns.

Word	Noun	Adjective	Verb	Adverb
snafu	Yes	Yes	Yes	No
flub	Yes	No	Yes	No

As nouns, flub is a hypernym of snafu; that is, flub 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
flub: an embarrassing mistake

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

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

snafu (adjective)	flub (adjective)
snarled or stalled in complete confusion

snafu (verb)	flub (verb)
cause to be in a state of complete confusion	make a mess of, destroy or ruin