deluge vs inundation

deluge and inundation both are nouns.

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

As nouns, deluge and inundation are synonyms defined as:

deluge and inundation: the rising of a body of water and its overflowing onto normally dry land

Other synonyms of deluge include alluvion, flood.

As nouns, deluge and inundation are synonyms defined as:

Other synonyms of deluge include flood, torrent.

deluge (noun)	inundation (noun)
a heavy rain	the rising of a body of water and its overflowing onto normally dry land
the rising of a body of water and its overflowing onto normally dry land	an overwhelming number or amount
an overwhelming number or amount

deluge (verb)	inundation (verb)
fill or cover completely, usually with water
charge someone with too many tasks
fill quickly beyond capacity; as with a liquid