alluvial deposit vs alluvion

alluvial deposit and alluvion both are nouns.

Word	Noun	Adjective	Verb	Adverb
alluvial deposit	Yes	No	No	No
alluvion	Yes	No	No	No

As nouns, alluvial deposit and alluvion are synonyms defined as:

alluvial deposit and alluvion: clay or silt or gravel carried by rushing streams and deposited where the stream slows down

Other synonyms of alluvial deposit include alluvial sediment, alluvium.

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