spread over vs submerge

spread over and submerge both are verbs.

Word	Noun	Adjective	Verb	Adverb
spread over	No	No	Yes	No
submerge	No	No	Yes	No

As verbs, submerge is a hyponym of spread over; that is, submerge is a word with a more specific, narrower meaning than spread over:

spread over (verb)	submerge (verb)
form a cover over	fill or cover completely, usually with water
	cover completely or make imperceptible
	put under water
	sink below the surface; go under or as if under water