alluvion vs the Flood

alluvion and the Flood both are nouns.

Word	Noun	Adjective	Verb	Adverb
alluvion	Yes	No	No	No
the Flood	Yes	No	No	No

As nouns, the Flood is a hyponym of alluvion; that is, the Flood is a word with a more specific, narrower meaning than alluvion:

alluvion: the rising of a body of water and its overflowing onto normally dry land
the Flood: (Biblical) the great deluge that is said in the Book of Genesis to have occurred in the time of Noah; it was brought by God upon the earth because of the wickedness of human beings

Other hyponyms of alluvion include debacle, flash flood, flashflood, Noachian deluge, Noah's flood, Noah and the Flood.

alluvion (noun)	the Flood (noun)
clay or silt or gravel carried by rushing streams and deposited where the stream slows down	(Biblical) the great deluge that is said in the Book of Genesis to have occurred in the time of Noah; it was brought by God upon the earth because of the wickedness of human beings
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