deluge vs submerge

deluge is a noun but submerge is not a noun.

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

As verbs, deluge and submerge are synonyms defined as:

Other synonyms of deluge include inundate.

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

deluge (verb)	submerge (verb)
fill or cover completely, usually with water	fill or cover completely, usually with water
charge someone with too many tasks	cover completely or make imperceptible
fill quickly beyond capacity; as with a liquid	put under water
	sink below the surface; go under or as if under water