alluvion vs inundation

alluvion and inundation both are nouns.

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

As nouns, alluvion and inundation are synonyms defined as:

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

Other synonyms of alluvion include deluge, flood.

alluvion (noun)	inundation (noun)
clay or silt or gravel carried by rushing streams and deposited where the stream slows down	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
gradual formation of new land, by recession of the sea or deposit of sediment