debacle vs inundation

debacle and inundation both are nouns.

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

As nouns, inundation is a hypernym of debacle; that is, inundation is a word with a broader meaning than debacle:

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

Other hypernyms of debacle include alluvion, deluge, flood.

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