immerse vs immersion

immerse is not a noun while immersion is a noun.

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

immerse (noun)	immersion (noun)
	a form of baptism in which part or all of a person's body is submerged
	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

immerse (verb)	immersion (verb)
devote (oneself) fully to
cause to be immersed
thrust or throw into
enclose or envelop completely, as if by swallowing