inundation vs alluvion

inundation and alluvion both are nouns.

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

As nouns, inundation and alluvion are synonyms defined as:

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

Other synonyms of inundation include deluge, flood.

inundation (noun)	alluvion (noun)
the rising of a body of water and its overflowing onto normally dry land	clay or silt or gravel carried by rushing streams and deposited where the stream slows down
an overwhelming number or amount	the rising of a body of water and its overflowing onto normally dry land
	gradual formation of new land, by recession of the sea or deposit of sediment