submerge vs deluge

submerge is not a noun while deluge is a noun.

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

As verbs, submerge and deluge are synonyms defined as:

Other synonyms of submerge include inundate.

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

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