submerging vs submergence

submerging and submergence both are nouns.

Word	Noun	Adjective	Verb	Adverb
submerging	Yes	No	No	No
submergence	Yes	No	No	No

As nouns, submerging and submergence are synonyms defined as:

Other synonyms of submerging include immersion, submersion.

submerging (noun)	submergence (noun)
sinking until covered completely with water	sinking until covered completely with water