debacle vs fiasco

debacle and fiasco both are nouns.

Word	Noun	Adjective	Verb	Adverb
debacle	Yes	No	No	No
fiasco	Yes	No	No	No

As nouns, debacle and fiasco are synonyms defined as:

debacle (noun)	fiasco (noun)
a sound defeat	a sudden and violent collapse
a sudden and violent collapse
flooding caused by a tumultuous breakup of ice in a river during the spring or summer