submerge vs dive

submerge is not a noun while dive is a noun.

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

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

Other hyponyms of submerge include drown.

submerge (noun)	dive (noun)
	a steep nose-down descent by an aircraft
	a headlong plunge into water
	a cheap disreputable nightclub or dance hall

submerge (verb)	dive (verb)
fill or cover completely, usually with water	drop steeply
cover completely or make imperceptible	swim under water
put under water	plunge into water
sink below the surface; go under or as if under water