immersion vs submergence

immersion and submergence both are nouns.

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

As nouns, immersion and submergence are synonyms defined as:

Other synonyms of immersion include submerging, submersion.

immersion (noun)	submergence (noun)
a form of baptism in which part or all of a person's body is submerged	sinking until covered completely with water
the act of wetting something by submerging it
complete attention; intense mental effort
sinking until covered completely with water
(astronomy) the disappearance of a celestial body prior to an eclipse