ducking vs immersion

ducking and immersion both are nouns.

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

As nouns, ducking and immersion are synonyms defined as:

Other synonyms of ducking include dousing, submersion.

ducking (noun)	immersion (noun)
the act of wetting something by submerging it	a form of baptism in which part or all of a person's body is submerged
hunting ducks	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