overwhelm vs submerge

overwhelm and submerge both are verbs.

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

As verbs, overwhelm and submerge are synonyms defined as:

Other synonyms of overwhelm include drown.

overwhelm (verb)	submerge (verb)
charge someone with too many tasks	fill or cover completely, usually with water
overcome by superior force	cover completely or make imperceptible
cover completely or make imperceptible	put under water
overcome, as with emotions or perceptual stimuli	sink below the surface; go under or as if under water