submerge vs inundate

submerge and inundate both are verbs.

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

As verbs, submerge and inundate are synonyms defined as:

Other synonyms of submerge include deluge.

submerge (verb)	inundate (verb)
fill or cover completely, usually with water	fill or cover completely, usually with water
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