inundation vs debacle

inundation and debacle both are nouns.

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

As nouns, debacle is a hyponym of inundation; that is, debacle is a word with a more specific, narrower meaning than inundation:

inundation: the rising of a body of water and its overflowing onto normally dry land
debacle: flooding caused by a tumultuous breakup of ice in a river during the spring or summer

Other hyponyms of inundation include flash flood, flashflood, Noachian deluge, Noah's flood, Noah and the Flood, the Flood.

inundation (noun)	debacle (noun)
the rising of a body of water and its overflowing onto normally dry land	a sound defeat
an overwhelming number or amount	a sudden and violent collapse
	flooding caused by a tumultuous breakup of ice in a river during the spring or summer